JezK

Edit File: themes.php

<?php
/**
 * Themes administration panel.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

if ( ! current_user_can( 'switch_themes' ) && ! current_user_can( 'edit_theme_options' ) ) {
	wp_die(
		'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
		'<p>' . __( 'Sorry, you are not allowed to edit theme options on this site.' ) . '</p>',
		403
	);
}

if ( current_user_can( 'switch_themes' ) && isset( $_GET['action'] ) ) {
	if ( 'activate' === $_GET['action'] ) {
		check_admin_referer( 'switch-theme_' . $_GET['stylesheet'] );
		$theme = wp_get_theme( $_GET['stylesheet'] );

if ( ! $theme->exists() || ! $theme->is_allowed() ) {
			wp_die(
				'<h1>' . __( 'An error occurred.' ) . '</h1>' .
				'<p>' . __( 'The requested theme does not exist.' ) . '</p>',
				403
			);
		}

switch_theme( $theme->get_stylesheet() );
		wp_redirect( admin_url( 'themes.php?activated=true' ) );
		exit;
	} elseif ( 'resume' === $_GET['action'] ) {
		check_admin_referer( 'resume-theme_' . $_GET['stylesheet'] );
		$theme = wp_get_theme( $_GET['stylesheet'] );

if ( ! current_user_can( 'resume_theme', $_GET['stylesheet'] ) ) {
			wp_die(
				'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
				'<p>' . __( 'Sorry, you are not allowed to resume this theme.' ) . '</p>',
				403
			);
		}

$result = resume_theme( $theme->get_stylesheet(), self_admin_url( 'themes.php?error=resuming' ) );

if ( is_wp_error( $result ) ) {
			wp_die( $result );
		}

wp_redirect( admin_url( 'themes.php?resumed=true' ) );
		exit;
	} elseif ( 'delete' === $_GET['action'] ) {
		check_admin_referer( 'delete-theme_' . $_GET['stylesheet'] );
		$theme = wp_get_theme( $_GET['stylesheet'] );

if ( ! current_user_can( 'delete_themes' ) ) {
			wp_die(
				'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
				'<p>' . __( 'Sorry, you are not allowed to delete this item.' ) . '</p>',
				403
			);
		}

if ( ! $theme->exists() ) {
			wp_die(
				'<h1>' . __( 'An error occurred while deleting the theme.' ) . '</h1>' .
				'<p>' . __( 'The requested theme does not exist.' ) . '</p>',
				403
			);
		}

$active = wp_get_theme();
		if ( $active->get( 'Template' ) === $_GET['stylesheet'] ) {
			wp_redirect( admin_url( 'themes.php?delete-active-child=true' ) );
		} else {
			delete_theme( $_GET['stylesheet'] );
			wp_redirect( admin_url( 'themes.php?deleted=true' ) );
		}
		exit;
	} elseif ( 'enable-auto-update' === $_GET['action'] ) {
		if ( ! ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) ) {
			wp_die( __( 'Sorry, you are not allowed to enable themes automatic updates.' ) );
		}

check_admin_referer( 'updates' );

$all_items    = wp_get_themes();
		$auto_updates = (array) get_site_option( 'auto_update_themes', array() );

$auto_updates[] = $_GET['stylesheet'];
		$auto_updates   = array_unique( $auto_updates );
		// Remove themes that have been deleted since the site option was last updated.
		$auto_updates = array_intersect( $auto_updates, array_keys( $all_items ) );

update_site_option( 'auto_update_themes', $auto_updates );

wp_redirect( admin_url( 'themes.php?enabled-auto-update=true' ) );

exit;
	} elseif ( 'disable-auto-update' === $_GET['action'] ) {
		if ( ! ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) ) {
			wp_die( __( 'Sorry, you are not allowed to disable themes automatic updates.' ) );
		}

check_admin_referer( 'updates' );

$all_items    = wp_get_themes();
		$auto_updates = (array) get_site_option( 'auto_update_themes', array() );

$auto_updates = array_diff( $auto_updates, array( $_GET['stylesheet'] ) );
		// Remove themes that have been deleted since the site option was last updated.
		$auto_updates = array_intersect( $auto_updates, array_keys( $all_items ) );

update_site_option( 'auto_update_themes', $auto_updates );

wp_redirect( admin_url( 'themes.php?disabled-auto-update=true' ) );

exit;
	}
}

// Used in the HTML title tag.
$title       = __( 'Themes' );
$parent_file = 'themes.php';

// Help tab: Overview.
if ( current_user_can( 'switch_themes' ) ) {
	$help_overview = '<p>' . __( 'This screen is used for managing your installed themes. Aside from the default theme(s) included with your WordPress installation, themes are designed and developed by third parties.' ) . '</p>' .
		'<p>' . __( 'From this screen you can:' ) . '</p>' .
		'<ul><li>' . __( 'Hover or tap to see Activate and Live Preview buttons' ) . '</li>' .
		'<li>' . __( 'Click on the theme to see the theme name, version, author, description, tags, and the Delete link' ) . '</li>' .
		'<li>' . __( 'Click Customize for the active theme or Live Preview for any other theme to see a live preview' ) . '</li></ul>' .
		'<p>' . __( 'The active theme is displayed highlighted as the first theme.' ) . '</p>' .
		'<p>' . __( 'The search for installed themes will search for terms in their name, description, author, or tag.' ) . ' <span id="live-search-desc">' . __( 'The search results will be updated as you type.' ) . '</span></p>';

get_current_screen()->add_help_tab(
		array(
			'id'      => 'overview',
			'title'   => __( 'Overview' ),
			'content' => $help_overview,
		)
	);
} // End if 'switch_themes'.

// Help tab: Adding Themes.
if ( current_user_can( 'install_themes' ) ) {
	if ( is_multisite() ) {
		$help_install = '<p>' . __( 'Installing themes on Multisite can only be done from the Network Admin section.' ) . '</p>';
	} else {
		$help_install = '<p>' . sprintf(
			/* translators: %s: https://wordpress.org/themes/ */
			__( 'If you would like to see more themes to choose from, click on the &#8220;Add Theme&#8221; button and you will be able to browse or search for additional themes from the <a href="%s">WordPress Theme Directory</a>. Themes in the WordPress Theme Directory are designed and developed by third parties, and are compatible with the license WordPress uses. Oh, and they are free!' ),
			__( 'https://wordpress.org/themes/' )
		) . '</p>';
	}

get_current_screen()->add_help_tab(
		array(
			'id'      => 'adding-themes',
			'title'   => __( 'Adding Themes' ),
			'content' => $help_install,
		)
	);
} // End if 'install_themes'.

// Help tab: Previewing and Customizing.
if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
	$help_customize =
		'<p>' . __( 'Tap or hover on any theme then click the Live Preview button to see a live preview of that theme and change theme options in a separate, full-screen view. You can also find a Live Preview button at the bottom of the theme details screen. Any installed theme can be previewed and customized in this way.' ) . '</p>' .
		'<p>' . __( 'The theme being previewed is fully interactive &mdash; navigate to different pages to see how the theme handles posts, archives, and other page templates. The settings may differ depending on what theme features the theme being previewed supports. To accept the new settings and activate the theme all in one step, click the Activate &amp; Publish button above the menu.' ) . '</p>' .
		'<p>' . __( 'When previewing on smaller monitors, you can use the collapse icon at the bottom of the left-hand pane. This will hide the pane, giving you more room to preview your site in the new theme. To bring the pane back, click on the collapse icon again.' ) . '</p>';

get_current_screen()->add_help_tab(
		array(
			'id'      => 'customize-preview-themes',
			'title'   => __( 'Previewing and Customizing' ),
			'content' => $help_customize,
		)
	);
} // End if 'edit_theme_options' && 'customize'.

$help_sidebar_autoupdates = '';

// Help tab: Auto-updates.
if ( current_user_can( 'update_themes' ) && wp_is_auto_update_enabled_for_type( 'theme' ) ) {
	$help_tab_autoupdates =
		'<p>' . __( 'Auto-updates can be enabled or disabled for each individual theme. Themes with auto-updates enabled will display the estimated date of the next auto-update. Auto-updates depends on the WP-Cron task scheduling system.' ) . '</p>' .
		'<p>' . __( 'Please note: Third-party themes and plugins, or custom code, may override WordPress scheduling.' ) . '</p>';

get_current_screen()->add_help_tab(
		array(
			'id'      => 'plugins-themes-auto-updates',
			'title'   => __( 'Auto-updates' ),
			'content' => $help_tab_autoupdates,
		)
	);

$help_sidebar_autoupdates = '<p>' . __( '<a href="https://wordpress.org/documentation/article/plugins-themes-auto-updates/">Documentation on Auto-updates</a>' ) . '</p>';
} // End if 'update_themes' && 'wp_is_auto_update_enabled_for_type'.

get_current_screen()->set_help_sidebar(
	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
	'<p>' . __( '<a href="https://wordpress.org/documentation/article/work-with-themes/">Documentation on Using Themes</a>' ) . '</p>' .
	'<p>' . __( '<a href="https://wordpress.org/documentation/article/appearance-themes-screen/">Documentation on Managing Themes</a>' ) . '</p>' .
	$help_sidebar_autoupdates .
	'<p>' . __( '<a href="https://wordpress.org/support/forums/">Support forums</a>' ) . '</p>'
);

if ( current_user_can( 'switch_themes' ) ) {
	$themes = wp_prepare_themes_for_js();
} else {
	$themes = wp_prepare_themes_for_js( array( wp_get_theme() ) );
}

$theme  = ! empty( $_REQUEST['theme'] ) ? sanitize_text_field( $_REQUEST['theme'] ) : '';
$search = ! empty( $_REQUEST['search'] ) ? sanitize_text_field( $_REQUEST['search'] ) : '';

wp_localize_script(
	'theme',
	'_wpThemeSettings',
	array(
		'themes'   => $themes,
		'settings' => array(
			'canInstall'    => ( ! is_multisite() && current_user_can( 'install_themes' ) ),
			'installURI'    => ( ! is_multisite() && current_user_can( 'install_themes' ) ) ? admin_url( 'theme-install.php' ) : null,
			'confirmDelete' => __( "Are you sure you want to delete this theme?\n\nClick 'Cancel' to go back, 'OK' to confirm the delete." ),
			'adminUrl'      => parse_url( admin_url(), PHP_URL_PATH ),
		),
		'l10n'     => array(
			'addNew'        => __( 'Add Theme' ),
			'search'        => __( 'Search installed themes' ),
			/* translators: %d: Number of themes. */
			'themesFound'   => __( 'Number of Themes found: %d' ),
			'noThemesFound' => __( 'No themes found. Try a different search.' ),
		),
	)
);

add_thickbox();
wp_enqueue_script( 'theme' );
wp_enqueue_script( 'updates' );

require_once ABSPATH . 'wp-admin/admin-header.php';
?>

<div class="wrap">
	<h1 class="wp-heading-inline"><?php esc_html_e( 'Themes' ); ?>
		<span class="title-count theme-count"><?php echo ! empty( $_GET['search'] ) ? __( '&hellip;' ) : count( $themes ); ?></span>
	</h1>
	<?php if ( ! is_multisite() && current_user_can( 'install_themes' ) ) : ?>
		<a href="<?php echo esc_url( admin_url( 'theme-install.php' ) ); ?>" class="hide-if-no-js page-title-action"><?php echo esc_html__( 'Add Theme' ); ?></a>
	<?php endif; ?>
	<hr class="wp-header-end">
	<form class="search-form search-themes"><p class="search-box"></p></form>

<?php
if ( ! validate_current_theme() || isset( $_GET['broken'] ) ) {
	wp_admin_notice(
		__( 'The active theme is broken. Reverting to the default theme.' ),
		array(
			'id'                 => 'message1',
			'additional_classes' => array( 'updated' ),
			'dismissible'        => true,
		)
	);
} elseif ( isset( $_GET['activated'] ) ) {
	if ( isset( $_GET['previewed'] ) ) {
		wp_admin_notice(
			__( 'Settings saved and theme activated.' ) . ' <a href="' . esc_url( home_url( '/' ) ) . '">' . __( 'Visit site' ) . '</a>',
			array(
				'id'                 => 'message2',
				'additional_classes' => array( 'updated' ),
				'dismissible'        => true,
			)
		);
	} else {
		wp_admin_notice(
			__( 'New theme activated.' ) . ' <a href="' . esc_url( home_url( '/' ) ) . '">' . __( 'Visit site' ) . '</a>',
			array(
				'id'                 => 'message2',
				'additional_classes' => array( 'updated' ),
				'dismissible'        => true,
			)
		);
	}
} elseif ( isset( $_GET['deleted'] ) ) {
	wp_admin_notice(
		__( 'Theme deleted.' ),
		array(
			'id'                 => 'message3',
			'additional_classes' => array( 'updated' ),
			'dismissible'        => true,
		)
	);
} elseif ( isset( $_GET['delete-active-child'] ) ) {
	wp_admin_notice(
		__( 'You cannot delete a theme while it has an active child theme.' ),
		array(
			'id'                 => 'message4',
			'additional_classes' => array( 'error' ),
		)
	);
} elseif ( isset( $_GET['resumed'] ) ) {
	wp_admin_notice(
		__( 'Theme resumed.' ),
		array(
			'id'                 => 'message5',
			'additional_classes' => array( 'updated' ),
			'dismissible'        => true,
		)
	);
} elseif ( isset( $_GET['error'] ) && 'resuming' === $_GET['error'] ) {
	wp_admin_notice(
		__( 'Theme could not be resumed because it triggered a <strong>fatal error</strong>.' ),
		array(
			'id'                 => 'message6',
			'additional_classes' => array( 'error' ),
		)
	);
} elseif ( isset( $_GET['enabled-auto-update'] ) ) {
	wp_admin_notice(
		__( 'Theme will be auto-updated.' ),
		array(
			'id'                 => 'message7',
			'additional_classes' => array( 'updated' ),
			'dismissible'        => true,
		)
	);
} elseif ( isset( $_GET['disabled-auto-update'] ) ) {
	wp_admin_notice(
		__( 'Theme will no longer be auto-updated.' ),
		array(
			'id'                 => 'message8',
			'additional_classes' => array( 'updated' ),
			'dismissible'        => true,
		)
	);
}

$current_theme = wp_get_theme();

if ( $current_theme->errors() && ( ! is_multisite() || current_user_can( 'manage_network_themes' ) ) ) {
	wp_admin_notice(
		'<strong>' . __( 'Error:' ) . '</strong> ' . $current_theme->errors()->get_error_message(),
		array(
			'additional_classes' => array( 'error' ),
		)
	);
}

$current_theme_actions = array();

if ( is_array( $submenu ) && isset( $submenu['themes.php'] ) ) {
	$forbidden_paths = array(
		'themes.php',
		'theme-editor.php',
		'site-editor.php',
		'edit.php?post_type=wp_navigation',
	);

foreach ( (array) $submenu['themes.php'] as $item ) {
		$class = '';

if ( in_array( $item[2], $forbidden_paths, true ) || str_starts_with( $item[2], 'customize.php' ) ) {
			continue;
		}

// 0 = name, 1 = capability, 2 = file.
		if ( 0 === strcmp( $self, $item[2] ) && empty( $parent_file )
			|| $parent_file && $item[2] === $parent_file
		) {
			$class = ' current';
		}

if ( ! empty( $submenu[ $item[2] ] ) ) {
			$submenu[ $item[2] ] = array_values( $submenu[ $item[2] ] ); // Re-index.
			$menu_hook           = get_plugin_page_hook( $submenu[ $item[2] ][0][2], $item[2] );

if ( file_exists( WP_PLUGIN_DIR . "/{$submenu[$item[2]][0][2]}" ) || ! empty( $menu_hook ) ) {
				$current_theme_actions[] = "<a class='button button-compact$class' href='admin.php?page={$submenu[$item[2]][0][2]}'>{$item[0]}</a>";
			} else {
				$current_theme_actions[] = "<a class='button button-compact$class' href='{$submenu[$item[2]][0][2]}'>{$item[0]}</a>";
			}
		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
			$menu_file = $item[2];

if ( current_user_can( 'customize' ) ) {
				if ( 'custom-header' === $menu_file ) {
					$current_theme_actions[] = "<a class='button button-compact hide-if-no-customize$class' href='customize.php?autofocus[control]=header_image'>{$item[0]}</a>";
				} elseif ( 'custom-background' === $menu_file ) {
					$current_theme_actions[] = "<a class='button button-compact hide-if-no-customize$class' href='customize.php?autofocus[control]=background_image'>{$item[0]}</a>";
				}
			}

$pos = strpos( $menu_file, '?' );
			if ( false !== $pos ) {
				$menu_file = substr( $menu_file, 0, $pos );
			}

if ( file_exists( ABSPATH . "wp-admin/$menu_file" ) ) {
				$current_theme_actions[] = "<a class='button button-compact$class' href='{$item[2]}'>{$item[0]}</a>";
			} else {
				$current_theme_actions[] = "<a class='button button-compact$class' href='themes.php?page={$item[2]}'>{$item[0]}</a>";
			}
		}
	}
}

$class_name = 'theme-browser';
if ( ! empty( $_GET['search'] ) ) {
	$class_name .= ' search-loading';
}
?>
<div class="<?php echo esc_attr( $class_name ); ?>">
	<div class="themes wp-clearfix">

<?php
/*
 * This PHP is synchronized with the tmpl-theme template below!
 */

foreach ( $themes as $theme ) :
	$aria_action = $theme['id'] . '-action';
	$aria_name   = $theme['id'] . '-name';

$active_class = '';
	if ( $theme['active'] ) {
		$active_class = ' active';
	}
	?>
<div class="theme<?php echo $active_class; ?>">
	<?php if ( ! empty( $theme['screenshot'][0] ) ) { ?>
		<div class="theme-screenshot">
			<img src="<?php echo esc_url( $theme['screenshot'][0] . '?ver=' . $theme['version'] ); ?>" alt="" />
		</div>
	<?php } else { ?>
		<div class="theme-screenshot blank"></div>
	<?php } ?>

<?php if ( $theme['hasUpdate'] ) : ?>
		<?php
		if ( $theme['updateResponse']['compatibleWP'] && $theme['updateResponse']['compatiblePHP'] ) :
			if ( $theme['hasPackage'] ) {
				$new_version_available = __( 'New version available. <button class="button-link" type="button">Update now</button>' );
			} else {
				$new_version_available = __( 'New version available.' );
			}
			wp_admin_notice(
				$new_version_available,
				array(
					'type'               => 'warning',
					'additional_classes' => array( 'notice-alt', 'inline', 'update-message' ),
				)
			);
		else :
			$theme_update_error = '';
			if ( ! $theme['updateResponse']['compatibleWP'] && ! $theme['updateResponse']['compatiblePHP'] ) {
				$theme_update_error .= sprintf(
					/* translators: %s: Theme name. */
					__( 'There is a new version of %s available, but it does not work with your versions of WordPress and PHP.' ),
					$theme['name']
				);
				if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
					$theme_update_error .= sprintf(
						/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
						' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
						self_admin_url( 'update-core.php' ),
						esc_url( wp_get_update_php_url() )
					);
					wp_update_php_annotation( '</p><p><em>', '</em>', false );
				} elseif ( current_user_can( 'update_core' ) ) {
					$theme_update_error .= sprintf(
						/* translators: %s: URL to WordPress Updates screen. */
						' ' . __( '<a href="%s">Please update WordPress</a>.' ),
						self_admin_url( 'update-core.php' )
					);
				} elseif ( current_user_can( 'update_php' ) ) {
					$theme_update_error .= sprintf(
						/* translators: %s: URL to Update PHP page. */
						' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
						esc_url( wp_get_update_php_url() )
					);
					wp_update_php_annotation( '</p><p><em>', '</em>', false );
				}
			} elseif ( ! $theme['updateResponse']['compatibleWP'] ) {
				$theme_update_error .= sprintf(
					/* translators: %s: Theme name. */
					__( 'There is a new version of %s available, but it does not work with your version of WordPress.' ),
					$theme['name']
				);
				if ( current_user_can( 'update_core' ) ) {
					$theme_update_error .= sprintf(
						/* translators: %s: URL to WordPress Updates screen. */
						' ' . __( '<a href="%s">Please update WordPress</a>.' ),
						self_admin_url( 'update-core.php' )
					);
				}
			} elseif ( ! $theme['updateResponse']['compatiblePHP'] ) {
				$theme_update_error .= sprintf(
					/* translators: %s: Theme name. */
					__( 'There is a new version of %s available, but it does not work with your version of PHP.' ),
					$theme['name']
				);
				if ( current_user_can( 'update_php' ) ) {
					$theme_update_error .= sprintf(
						/* translators: %s: URL to Update PHP page. */
						' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
						esc_url( wp_get_update_php_url() )
					);
					wp_update_php_annotation( '</p><p><em>', '</em>', false );
				}
			}
			wp_admin_notice(
				$theme_update_error,
				array(
					'type'               => 'error',
					'additional_classes' => array( 'notice-alt', 'inline', 'update-message' ),
				)
			);
		endif;
	endif;

if ( ! $theme['compatibleWP'] || ! $theme['compatiblePHP'] ) {
		$message = '';
		if ( ! $theme['compatibleWP'] && ! $theme['compatiblePHP'] ) {
			$message = __( 'This theme does not work with your versions of WordPress and PHP.' );
			if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
				$message .= sprintf(
					/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
					' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
					self_admin_url( 'update-core.php' ),
					esc_url( wp_get_update_php_url() )
				);
				$message .= wp_update_php_annotation( '</p><p><em>', '</em>', false );
			} elseif ( current_user_can( 'update_core' ) ) {
				$message .= sprintf(
					/* translators: %s: URL to WordPress Updates screen. */
					' ' . __( '<a href="%s">Please update WordPress</a>.' ),
					self_admin_url( 'update-core.php' )
				);
			} elseif ( current_user_can( 'update_php' ) ) {
				$message .= sprintf(
					/* translators: %s: URL to Update PHP page. */
					' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
					esc_url( wp_get_update_php_url() )
				);
				$message .= wp_update_php_annotation( '</p><p><em>', '</em>', false );
			}
		} elseif ( ! $theme['compatibleWP'] ) {
			$message .= __( 'This theme does not work with your version of WordPress.' );
			if ( current_user_can( 'update_core' ) ) {
				$message .= sprintf(
					/* translators: %s: URL to WordPress Updates screen. */
					' ' . __( '<a href="%s">Please update WordPress</a>.' ),
					self_admin_url( 'update-core.php' )
				);
			}
		} elseif ( ! $theme['compatiblePHP'] ) {
			$message .= __( 'This theme does not work with your version of PHP.' );
			if ( current_user_can( 'update_php' ) ) {
				$message .= sprintf(
					/* translators: %s: URL to Update PHP page. */
					' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
					esc_url( wp_get_update_php_url() )
				);
				$message .= wp_update_php_annotation( '</p><p><em>', '</em>', false );
			}
		}

wp_admin_notice(
			$message,
			array(
				'type'               => 'error',
				'additional_classes' => array( 'inline', 'notice-alt' ),
			)
		);
	}

/* translators: %s: Theme name. */
	$details_aria_label = sprintf( _x( 'View Theme Details for %s', 'theme' ), $theme['name'] );
	?>
	<button type="button" class="more-details" id="<?php echo esc_attr( $aria_action ); ?>"
		aria-label="<?php echo esc_attr( $details_aria_label ); ?>"
	><?php _e( 'Theme Details' ); ?></button>
	<div class="theme-author">
		<?php
		/* translators: %s: Theme author name. */
		printf( __( 'By %s' ), $theme['author'] );
		?>
	</div>

<div class="theme-actions">
		<?php if ( $theme['active'] ) { ?>
			<?php
			if ( $theme['actions']['customize'] && current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
				/* translators: %s: Theme name. */
				$customize_aria_label = sprintf( _x( 'Customize %s', 'theme' ), $theme['name'] );
				?>
				<a class="button button-compact button-primary customize load-customize hide-if-no-customize"
					href="<?php echo esc_url( $theme['actions']['customize'] ); ?>"
					aria-label="<?php echo esc_attr( $customize_aria_label ); ?>"
				><?php _e( 'Customize' ); ?></a>
			<?php } ?>
		<?php } elseif ( $theme['compatibleWP'] && $theme['compatiblePHP'] ) { ?>
			<?php
			/* translators: %s: Theme name. */
			$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
			?>
			<a class="button button-compact activate"
				href="<?php echo esc_url( $theme['actions']['activate'] ); ?>"
				aria-label="<?php echo esc_attr( $aria_label ); ?>"
			><?php _e( 'Activate' ); ?></a>

<?php
			// Only classic themes require the "customize" capability.
			if ( current_user_can( 'edit_theme_options' ) && ( $theme['blockTheme'] || current_user_can( 'customize' ) ) ) {
				/* translators: %s: Theme name. */
				$live_preview_aria_label = sprintf( _x( 'Live Preview %s', 'theme' ), '{{ data.name }}' );
				?>
				<a class="button button-compact button-primary load-customize hide-if-no-customize"
					href="<?php echo esc_url( $theme['actions']['customize'] ); ?>"
					aria-label="<?php echo esc_attr( $live_preview_aria_label ); ?>"
				><?php _e( 'Live Preview' ); ?></a>
			<?php } ?>
		<?php } else { ?>
			<?php
			/* translators: %s: Theme name. */
			$aria_label = sprintf( _x( 'Cannot Activate %s', 'theme' ), '{{ data.name }}' );
			?>
			<a class="button button-compact disabled"
				aria-label="<?php echo esc_attr( $aria_label ); ?>"
			><?php _ex( 'Cannot Activate', 'theme' ); ?></a>

<?php
			if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
				/* translators: %s: Theme name. */
				$live_preview_aria_label = sprintf( _x( 'Live Preview %s', 'theme' ), '{{ data.name }}' );
				?>
				<a class="button button-compact button-primary hide-if-no-customize disabled"
					aria-label="<?php echo esc_attr( $live_preview_aria_label ); ?>"
				><?php _e( 'Live Preview' ); ?></a>
			<?php } ?>
		<?php } ?>

</div>
	</div>
</div>
<?php endforeach; ?>
	</div>
</div>
<div class="theme-overlay" tabindex="0" role="dialog" aria-label="<?php esc_attr_e( 'Theme Details' ); ?>"></div>

<?php
// List broken themes, if any.
$broken_themes = wp_get_themes( array( 'errors' => true ) );
if ( ! is_multisite() && $broken_themes ) {
	?>

<?php
	$can_resume  = current_user_can( 'resume_themes' );
	$can_delete  = current_user_can( 'delete_themes' );
	$can_install = current_user_can( 'install_themes' );
	?>
<table>
	<tr>
		<th><?php _ex( 'Name', 'theme name' ); ?></th>
		<th><?php _e( 'Description' ); ?></th>
		<?php if ( $can_resume ) { ?>
			<td></td>
		<?php } ?>
		<?php if ( $can_delete ) { ?>
			<td></td>
		<?php } ?>
		<?php if ( $can_install ) { ?>
			<td></td>
		<?php } ?>
	</tr>
	<?php
	foreach ( $broken_themes as $broken_theme ) :
		?>
		<tr>
			<td><?php echo $broken_theme->get( 'Name' ) ? $broken_theme->display( 'Name' ) : esc_html( $broken_theme->get_stylesheet() ); ?></td>
			<td><?php echo $broken_theme->errors()->get_error_message(); ?></td>
			<?php
			if ( $can_resume ) {
				if ( 'theme_paused' === $broken_theme->errors()->get_error_code() ) {
					$stylesheet = $broken_theme->get_stylesheet();
					$resume_url = add_query_arg(
						array(
							'action'     => 'resume',
							'stylesheet' => urlencode( $stylesheet ),
						),
						admin_url( 'themes.php' )
					);
					$resume_url = wp_nonce_url( $resume_url, 'resume-theme_' . $stylesheet );
					?>
					<td><a href="<?php echo esc_url( $resume_url ); ?>" class="button resume-theme"><?php _e( 'Resume' ); ?></a></td>
					<?php
				} else {
					?>
					<td></td>
					<?php
				}
			}

if ( $can_delete ) {
				$stylesheet = $broken_theme->get_stylesheet();
				$delete_url = add_query_arg(
					array(
						'action'     => 'delete',
						'stylesheet' => urlencode( $stylesheet ),
					),
					admin_url( 'themes.php' )
				);
				$delete_url = wp_nonce_url( $delete_url, 'delete-theme_' . $stylesheet );
				?>
				<td><a href="<?php echo esc_url( $delete_url ); ?>" class="button delete-theme"><?php _e( 'Delete' ); ?></a></td>
				<?php
			}

if ( $can_install && 'theme_no_parent' === $broken_theme->errors()->get_error_code() ) {
				$parent_theme_name = $broken_theme->get( 'Template' );
				$parent_theme      = themes_api( 'theme_information', array( 'slug' => urlencode( $parent_theme_name ) ) );

if ( ! is_wp_error( $parent_theme ) ) {
					$install_url = add_query_arg(
						array(
							'action' => 'install-theme',
							'theme'  => urlencode( $parent_theme_name ),
						),
						admin_url( 'update.php' )
					);
					$install_url = wp_nonce_url( $install_url, 'install-theme_' . $parent_theme_name );
					?>
					<td><a href="<?php echo esc_url( $install_url ); ?>" class="button install-theme"><?php _e( 'Install Parent Theme' ); ?></a></td>
					<?php
				}
			}
			?>
		</tr>
		<?php
	endforeach;
	?>
</table>
</div>

<?php
}
?>
</div>

<?php

/**
 * Returns the JavaScript template used to display the auto-update setting for a theme.
 *
 * @since 5.5.0
 *
 * @return string The template for displaying the auto-update setting link.
 */
function wp_theme_auto_update_setting_template() {
	$notice   = wp_get_admin_notice(
		'',
		array(
			'type'               => 'error',
			'additional_classes' => array( 'notice-alt', 'inline', 'hidden' ),
		)
	);
	$template = '
		<div class="theme-autoupdate">
			<# if ( data.autoupdate.supported ) { #>
				<# if ( data.autoupdate.forced === false ) { #>
					' . __( 'Auto-updates disabled' ) . '
				<# } else if ( data.autoupdate.forced ) { #>
					' . __( 'Auto-updates enabled' ) . '
				<# } else if ( data.autoupdate.enabled ) { #>
					<button type="button" class="toggle-auto-update button-link" data-slug="{{ data.id }}" data-wp-action="disable">
						<span class="dashicons dashicons-update spin hidden" aria-hidden="true"></span><span class="label">' . __( 'Disable auto-updates' ) . '</span>
					</button>
				<# } else { #>
					<button type="button" class="toggle-auto-update button-link" data-slug="{{ data.id }}" data-wp-action="enable">
						<span class="dashicons dashicons-update spin hidden" aria-hidden="true"></span><span class="label">' . __( 'Enable auto-updates' ) . '</span>
					</button>
				<# } #>
			<# } #>
			<# if ( data.hasUpdate ) { #>
				<# if ( data.autoupdate.supported && data.autoupdate.enabled ) { #>
					<span class="auto-update-time">
				<# } else { #>
					<span class="auto-update-time hidden">
				<# } #>
				<br />' . wp_get_auto_update_message() . '</span>
			<# } #>
			' . $notice . '
		</div>
	';

/**
	 * Filters the JavaScript template used to display the auto-update setting for a theme (in the overlay).
	 *
	 * See {@see wp_prepare_themes_for_js()} for the properties of the `data` object.
	 *
	 * @since 5.5.0
	 *
	 * @param string $template The template for displaying the auto-update setting link.
	 */
	return apply_filters( 'theme_auto_update_setting_template', $template );
}

/*
 * The tmpl-theme template is synchronized with PHP above!
 */
?>
<script id="tmpl-theme" type="text/template">
	<# if ( data.screenshot[0] ) { #>
		<div class="theme-screenshot">
			<img src="{{ data.screenshot[0] }}?ver={{ data.version }}" alt="" />
		</div>
	<# } else { #>
		<div class="theme-screenshot blank"></div>
	<# } #>

<# if ( data.hasUpdate ) { #>
		<# if ( data.updateResponse.compatibleWP && data.updateResponse.compatiblePHP ) { #>
			<div class="update-message notice inline notice-warning notice-alt"><p>
				<# if ( data.hasPackage ) { #>
					<?php _e( 'New version available. <button class="button-link" type="button">Update now</button>' ); ?>
				<# } else { #>
					<?php _e( 'New version available.' ); ?>
				<# } #>
			</p></div>
		<# } else { #>
			<div class="update-message notice inline notice-error notice-alt"><p>
				<# if ( ! data.updateResponse.compatibleWP && ! data.updateResponse.compatiblePHP ) { #>
					<?php
					printf(
						/* translators: %s: Theme name. */
						__( 'There is a new version of %s available, but it does not work with your versions of WordPress and PHP.' ),
						'{{{ data.name }}}'
					);
					if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
						printf(
							/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
							' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
							self_admin_url( 'update-core.php' ),
							esc_url( wp_get_update_php_url() )
						);
						wp_update_php_annotation( '</p><p><em>', '</em>' );
					} elseif ( current_user_can( 'update_core' ) ) {
						printf(
							/* translators: %s: URL to WordPress Updates screen. */
							' ' . __( '<a href="%s">Please update WordPress</a>.' ),
							self_admin_url( 'update-core.php' )
						);
					} elseif ( current_user_can( 'update_php' ) ) {
						printf(
							/* translators: %s: URL to Update PHP page. */
							' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
							esc_url( wp_get_update_php_url() )
						);
						wp_update_php_annotation( '</p><p><em>', '</em>' );
					}
					?>
				<# } else if ( ! data.updateResponse.compatibleWP ) { #>
					<?php
					printf(
						/* translators: %s: Theme name. */
						__( 'There is a new version of %s available, but it does not work with your version of WordPress.' ),
						'{{{ data.name }}}'
					);
					if ( current_user_can( 'update_core' ) ) {
						printf(
							/* translators: %s: URL to WordPress Updates screen. */
							' ' . __( '<a href="%s">Please update WordPress</a>.' ),
							self_admin_url( 'update-core.php' )
						);
					}
					?>
				<# } else if ( ! data.updateResponse.compatiblePHP ) { #>
					<?php
					printf(
						/* translators: %s: Theme name. */
						__( 'There is a new version of %s available, but it does not work with your version of PHP.' ),
						'{{{ data.name }}}'
					);
					if ( current_user_can( 'update_php' ) ) {
						printf(
							/* translators: %s: URL to Update PHP page. */
							' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
							esc_url( wp_get_update_php_url() )
						);
						wp_update_php_annotation( '</p><p><em>', '</em>' );
					}
					?>
				<# } #>
			</p></div>
		<# } #>
	<# } #>

<# if ( ! data.compatibleWP || ! data.compatiblePHP ) { #>
		<div class="notice notice-error notice-alt"><p>
			<# if ( ! data.compatibleWP && ! data.compatiblePHP ) { #>
				<?php
				_e( 'This theme does not work with your versions of WordPress and PHP.' );
				if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
					printf(
						/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
						' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
						self_admin_url( 'update-core.php' ),
						esc_url( wp_get_update_php_url() )
					);
					wp_update_php_annotation( '</p><p><em>', '</em>' );
				} elseif ( current_user_can( 'update_core' ) ) {
					printf(
						/* translators: %s: URL to WordPress Updates screen. */
						' ' . __( '<a href="%s">Please update WordPress</a>.' ),
						self_admin_url( 'update-core.php' )
					);
				} elseif ( current_user_can( 'update_php' ) ) {
					printf(
						/* translators: %s: URL to Update PHP page. */
						' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
						esc_url( wp_get_update_php_url() )
					);
					wp_update_php_annotation( '</p><p><em>', '</em>' );
				}
				?>
			<# } else if ( ! data.compatibleWP ) { #>
				<?php
				_e( 'This theme does not work with your version of WordPress.' );
				if ( current_user_can( 'update_core' ) ) {
					printf(
						/* translators: %s: URL to WordPress Updates screen. */
						' ' . __( '<a href="%s">Please update WordPress</a>.' ),
						self_admin_url( 'update-core.php' )
					);
				}
				?>
			<# } else if ( ! data.compatiblePHP ) { #>
				<?php
				_e( 'This theme does not work with your version of PHP.' );
				if ( current_user_can( 'update_php' ) ) {
					printf(
						/* translators: %s: URL to Update PHP page. */
						' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
						esc_url( wp_get_update_php_url() )
					);
					wp_update_php_annotation( '</p><p><em>', '</em>' );
				}
				?>
			<# } #>
		</p></div>
	<# } #>

<?php
	/* translators: %s: Theme name. */
	$details_aria_label = sprintf( _x( 'View Theme Details for %s', 'theme' ), '{{ data.name }}' );
	?>
	<button type="button" class="more-details" id="{{ data.id }}-action"
		aria-label="<?php echo esc_attr( $details_aria_label ); ?>"
	><?php _e( 'Theme Details' ); ?></button>
	<div class="theme-author">
		<?php
		/* translators: %s: Theme author name. */
		printf( __( 'By %s' ), '{{{ data.author }}}' );
		?>
	</div>

<?php
					/* translators: %s: Theme name. */
					$live_preview_aria_label = sprintf( _x( 'Live Preview %s', 'theme' ), '{{ data.name }}' );
					?>
					<a class="button button-compact button-primary load-customize hide-if-no-customize"
						href="{{{ data.actions.customize }}}"
						aria-label="<?php echo esc_attr( $live_preview_aria_label ); ?>"
					><?php _e( 'Live Preview' ); ?></a>
				<# } else { #>
					<?php
					/* translators: %s: Theme name. */
					$aria_label = sprintf( _x( 'Cannot Activate %s', 'theme' ), '{{ data.name }}' );
					?>
					<a class="button button-compact disabled"
						aria-label="<?php echo esc_attr( $aria_label ); ?>"
					><?php _ex( 'Cannot Activate', 'theme' ); ?></a>

<?php
					/* translators: %s: Theme name. */
					$live_preview_aria_label = sprintf( _x( 'Live Preview %s', 'theme' ), '{{ data.name }}' );
					?>
					<a class="button button-compact button-primary hide-if-no-customize disabled"
						aria-label="<?php echo esc_attr( $live_preview_aria_label ); ?>"
					><?php _e( 'Live Preview' ); ?></a>
				<# } #>
			<# } #>
		</div>
	</div>
</script>

<# if ( ! data.compatibleWP || ! data.compatiblePHP ) { #>
					<div class="notice notice-error notice-alt notice-large"><p>
						<# if ( ! data.compatibleWP && ! data.compatiblePHP ) { #>
							<?php
							_e( 'This theme does not work with your versions of WordPress and PHP.' );
							if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
								printf(
									/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
									' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
									self_admin_url( 'update-core.php' ),
									esc_url( wp_get_update_php_url() )
								);
								wp_update_php_annotation( '</p><p><em>', '</em>' );
							} elseif ( current_user_can( 'update_core' ) ) {
								printf(
									/* translators: %s: URL to WordPress Updates screen. */
									' ' . __( '<a href="%s">Please update WordPress</a>.' ),
									self_admin_url( 'update-core.php' )
								);
							} elseif ( current_user_can( 'update_php' ) ) {
								printf(
									/* translators: %s: URL to Update PHP page. */
									' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
									esc_url( wp_get_update_php_url() )
								);
								wp_update_php_annotation( '</p><p><em>', '</em>' );
							}
							?>
						<# } else if ( ! data.compatibleWP ) { #>
							<?php
							_e( 'This theme does not work with your version of WordPress.' );
							if ( current_user_can( 'update_core' ) ) {
								printf(
									/* translators: %s: URL to WordPress Updates screen. */
									' ' . __( '<a href="%s">Please update WordPress</a>.' ),
									self_admin_url( 'update-core.php' )
								);
							}
							?>
						<# } else if ( ! data.compatiblePHP ) { #>
							<?php
							_e( 'This theme does not work with your version of PHP.' );
							if ( current_user_can( 'update_php' ) ) {
								printf(
									/* translators: %s: URL to Update PHP page. */
									' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
									esc_url( wp_get_update_php_url() )
								);
								wp_update_php_annotation( '</p><p><em>', '</em>' );
							}
							?>
						<# } #>
					</p></div>
				<# } #>

<# if ( data.hasUpdate ) { #>
					<# if ( data.updateResponse.compatibleWP && data.updateResponse.compatiblePHP ) { #>
						<div class="notice notice-warning notice-alt notice-large">
							<h3 class="notice-title"><?php _e( 'Update Available' ); ?></h3>
							{{{ data.update }}}
						</div>
					<# } else { #>
						<div class="notice notice-error notice-alt notice-large">
							<h3 class="notice-title"><?php _e( 'Update Incompatible' ); ?></h3>
							<p>
								<# if ( ! data.updateResponse.compatibleWP && ! data.updateResponse.compatiblePHP ) { #>
									<?php
									printf(
										/* translators: %s: Theme name. */
										__( 'There is a new version of %s available, but it does not work with your versions of WordPress and PHP.' ),
										'{{{ data.name }}}'
									);
									if ( current_user_can( 'update_core' ) && current_user_can( 'update_php' ) ) {
										printf(
											/* translators: 1: URL to WordPress Updates screen, 2: URL to Update PHP page. */
											' ' . __( '<a href="%1$s">Please update WordPress</a>, and then <a href="%2$s">learn more about updating PHP</a>.' ),
											self_admin_url( 'update-core.php' ),
											esc_url( wp_get_update_php_url() )
										);
										wp_update_php_annotation( '</p><p><em>', '</em>' );
									} elseif ( current_user_can( 'update_core' ) ) {
										printf(
											/* translators: %s: URL to WordPress Updates screen. */
											' ' . __( '<a href="%s">Please update WordPress</a>.' ),
											self_admin_url( 'update-core.php' )
										);
									} elseif ( current_user_can( 'update_php' ) ) {
										printf(
											/* translators: %s: URL to Update PHP page. */
											' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
											esc_url( wp_get_update_php_url() )
										);
										wp_update_php_annotation( '</p><p><em>', '</em>' );
									}
									?>
								<# } else if ( ! data.updateResponse.compatibleWP ) { #>
									<?php
									printf(
										/* translators: %s: Theme name. */
										__( 'There is a new version of %s available, but it does not work with your version of WordPress.' ),
										'{{{ data.name }}}'
									);
									if ( current_user_can( 'update_core' ) ) {
										printf(
											/* translators: %s: URL to WordPress Updates screen. */
											' ' . __( '<a href="%s">Please update WordPress</a>.' ),
											self_admin_url( 'update-core.php' )
										);
									}
									?>
								<# } else if ( ! data.updateResponse.compatiblePHP ) { #>
									<?php
									printf(
										/* translators: %s: Theme name. */
										__( 'There is a new version of %s available, but it does not work with your version of PHP.' ),
										'{{{ data.name }}}'
									);
									if ( current_user_can( 'update_php' ) ) {
										printf(
											/* translators: %s: URL to Update PHP page. */
											' ' . __( '<a href="%s">Learn more about updating PHP</a>.' ),
											esc_url( wp_get_update_php_url() )
										);
										wp_update_php_annotation( '</p><p><em>', '</em>' );
									}
									?>
								<# } #>
							</p>
						</div>
					<# } #>
				<# } #>

<# if ( data.actions.autoupdate ) { #>
					<?php echo wp_theme_auto_update_setting_template(); ?>
				<# } #>

<p class="theme-description">{{{ data.description }}}</p>

<# if ( data.parent ) { #>
					<p class="parent-theme">
						<?php
						/* translators: %s: Theme name. */
						printf( __( 'This is a child theme of %s.' ), '<strong>{{{ data.parent }}}</strong>' );
						?>
					</p>
				<# } #>

<# if ( data.tags ) { #>
					<p class="theme-tags"><span><?php _e( 'Tags:' ); ?></span> {{{ data.tags }}}</p>
				<# } #>
			</div>
		</div>

<# if ( data.actions.activate ) { #>
						<?php
						/* translators: %s: Theme name. */
						$aria_label = sprintf( _x( 'Activate %s', 'theme' ), '{{ data.name }}' );
						?>
						<a class="button button-compact activate"
							href="{{{ data.actions.activate }}}"
							aria-label="<?php echo esc_attr( $aria_label ); ?>"
						><?php _e( 'Activate' ); ?></a>
					<# } #>
				<# } else { #>
					<?php
					/* translators: %s: Theme name. */
					$live_preview_aria_label = sprintf( _x( 'Live Preview %s', 'theme' ), '{{ data.name }}' );
					?>
					<a class="button button-compact button-primary hide-if-no-customize disabled"
						aria-label="<?php echo esc_attr( $live_preview_aria_label ); ?>"
					><?php _e( 'Live Preview' ); ?></a>

<# if ( data.actions.activate ) { #>
						<?php
						/* translators: %s: Theme name. */
						$aria_label = sprintf( _x( 'Cannot Activate %s', 'theme' ), '{{ data.name }}' );
						?>
						<a class="button button-compact disabled"
							aria-label="<?php echo esc_attr( $aria_label ); ?>"
						><?php _ex( 'Cannot Activate', 'theme' ); ?></a>
					<# } #>
				<# } #>
			</div>

<# if ( ! data.active && data.actions['delete'] ) { #>
				<?php
				/* translators: %s: Theme name. */
				$aria_label = sprintf( _x( 'Delete %s', 'theme' ), '{{ data.name }}' );
				?>
				<a class="button button-compact delete-theme"
					href="{{{ data.actions['delete'] }}}"
					aria-label="<?php echo esc_attr( $aria_label ); ?>"
				><?php _e( 'Delete' ); ?></a>
			<# } #>
		</div>
	</div>
</script>

<?php
wp_print_request_filesystem_credentials_modal();
wp_print_admin_notice_templates();
wp_print_update_row_templates();

wp_localize_script(
	'updates',
	'_wpUpdatesItemCounts',
	array(
		'totals' => wp_get_update_data(),
	)
);

require_once ABSPATH . 'wp-admin/admin-footer.php';

JezK

Edit File: themes.php

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