presentations/wp-admin/network/themes.php

<?php
/**
 * Multisite themes administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.1.0
 */

/** Load WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

if ( ! current_user_can( 'manage_network_themes' ) ) {
	wp_die( __( 'Sorry, you are not allowed to manage network themes.' ) );
}

$wp_list_table = _get_list_table( 'WP_MS_Themes_List_Table' );
$pagenum       = $wp_list_table->get_pagenum();

$action = $wp_list_table->current_action();

$s = isset( $_REQUEST['s'] ) ? $_REQUEST['s'] : '';

// Clean up request URI from temporary args for screen options/paging uri's to work as expected.
$temp_args              = array( 'enabled', 'disabled', 'deleted', 'error' );
$_SERVER['REQUEST_URI'] = remove_query_arg( $temp_args, $_SERVER['REQUEST_URI'] );
$referer                = remove_query_arg( $temp_args, wp_get_referer() );

if ( $action ) {
	switch ( $action ) {
		case 'enable':
			check_admin_referer( 'enable-theme_' . $_GET['theme'] );
			WP_Theme::network_enable_theme( $_GET['theme'] );
			if ( false === strpos( $referer, '/network/themes.php' ) ) {
				wp_redirect( network_admin_url( 'themes.php?enabled=1' ) );
			} else {
				wp_safe_redirect( add_query_arg( 'enabled', 1, $referer ) );
			}
			exit;
		case 'disable':
			check_admin_referer( 'disable-theme_' . $_GET['theme'] );
			WP_Theme::network_disable_theme( $_GET['theme'] );
			wp_safe_redirect( add_query_arg( 'disabled', '1', $referer ) );
			exit;
		case 'enable-selected':
			check_admin_referer( 'bulk-themes' );
			$themes = isset( $_POST['checked'] ) ? (array) $_POST['checked'] : array();
			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}
			WP_Theme::network_enable_theme( (array) $themes );
			wp_safe_redirect( add_query_arg( 'enabled', count( $themes ), $referer ) );
			exit;
		case 'disable-selected':
			check_admin_referer( 'bulk-themes' );
			$themes = isset( $_POST['checked'] ) ? (array) $_POST['checked'] : array();
			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}
			WP_Theme::network_disable_theme( (array) $themes );
			wp_safe_redirect( add_query_arg( 'disabled', count( $themes ), $referer ) );
			exit;
		case 'update-selected':
			check_admin_referer( 'bulk-themes' );

			if ( isset( $_GET['themes'] ) ) {
				$themes = explode( ',', $_GET['themes'] );
			} elseif ( isset( $_POST['checked'] ) ) {
				$themes = (array) $_POST['checked'];
			} else {
				$themes = array();
			}

			$title       = __( 'Update Themes' );
			$parent_file = 'themes.php';

			require_once( ABSPATH . 'wp-admin/admin-header.php' );

			echo '<div class="wrap">';
			echo '<h1>' . esc_html( $title ) . '</h1>';

			$url = self_admin_url( 'update.php?action=update-selected-themes&amp;themes=' . urlencode( join( ',', $themes ) ) );
			$url = wp_nonce_url( $url, 'bulk-update-themes' );

			echo "<iframe src='$url' style='width: 100%; height:100%; min-height:850px;'></iframe>";
			echo '</div>';
			require_once( ABSPATH . 'wp-admin/admin-footer.php' );
			exit;
		case 'delete-selected':
			if ( ! current_user_can( 'delete_themes' ) ) {
				wp_die( __( 'Sorry, you are not allowed to delete themes for this site.' ) );
			}

			check_admin_referer( 'bulk-themes' );

			$themes = isset( $_REQUEST['checked'] ) ? (array) $_REQUEST['checked'] : array();

			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}

			$themes = array_diff( $themes, array( get_option( 'stylesheet' ), get_option( 'template' ) ) );

			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'main', $referer ) );
				exit;
			}

			$theme_info = array();
			foreach ( $themes as $key => $theme ) {
				$theme_info[ $theme ] = wp_get_theme( $theme );
			}

			include( ABSPATH . 'wp-admin/update.php' );

			$parent_file = 'themes.php';

			if ( ! isset( $_REQUEST['verify-delete'] ) ) {
				wp_enqueue_script( 'jquery' );
				require_once( ABSPATH . 'wp-admin/admin-header.php' );
				$themes_to_delete = count( $themes );
				?>
			<div class="wrap">
				<?php if ( 1 == $themes_to_delete ) : ?>
					<h1><?php _e( 'Delete Theme' ); ?></h1>
					<div class="error"><p><strong><?php _e( 'Caution:' ); ?></strong> <?php _e( 'This theme may be active on other sites in the network.' ); ?></p></div>
					<p><?php _e( 'You are about to remove the following theme:' ); ?></p>
				<?php else : ?>
					<h1><?php _e( 'Delete Themes' ); ?></h1>
					<div class="error"><p><strong><?php _e( 'Caution:' ); ?></strong> <?php _e( 'These themes may be active on other sites in the network.' ); ?></p></div>
					<p><?php _e( 'You are about to remove the following themes:' ); ?></p>
				<?php endif; ?>
					<ul class="ul-disc">
					<?php
					foreach ( $theme_info as $theme ) {
						echo '<li>' . sprintf(
							/* translators: 1: theme name, 2: theme author */
							_x( '%1$s by %2$s', 'theme' ),
							'<strong>' . $theme->display( 'Name' ) . '</strong>',
							'<em>' . $theme->display( 'Author' ) . '</em>'
						) . '</li>';
					}
					?>
					</ul>
				<?php if ( 1 == $themes_to_delete ) : ?>
					<p><?php _e( 'Are you sure you wish to delete this theme?' ); ?></p>
				<?php else : ?>
					<p><?php _e( 'Are you sure you wish to delete these themes?' ); ?></p>
				<?php endif; ?>
				<form method="post" action="<?php echo esc_url( $_SERVER['REQUEST_URI'] ); ?>" style="display:inline;">
					<input type="hidden" name="verify-delete" value="1" />
					<input type="hidden" name="action" value="delete-selected" />
					<?php
					foreach ( (array) $themes as $theme ) {
						echo '<input type="hidden" name="checked[]" value="' . esc_attr( $theme ) . '" />';
					}

						wp_nonce_field( 'bulk-themes' );

					if ( 1 == $themes_to_delete ) {
						submit_button( __( 'Yes, delete this theme' ), '', 'submit', false );
					} else {
						submit_button( __( 'Yes, delete these themes' ), '', 'submit', false );
					}
					?>
				</form>
				<?php
				$referer = wp_get_referer();
				?>
				<form method="post" action="<?php echo $referer ? esc_url( $referer ) : ''; ?>" style="display:inline;">
					<?php submit_button( __( 'No, return me to the theme list' ), '', 'submit', false ); ?>
				</form>
			</div>
				<?php
				require_once( ABSPATH . 'wp-admin/admin-footer.php' );
				exit;
			} // Endif verify-delete

			foreach ( $themes as $theme ) {
				$delete_result = delete_theme(
					$theme,
					esc_url(
						add_query_arg(
							array(
								'verify-delete' => 1,
								'action'        => 'delete-selected',
								'checked'       => $_REQUEST['checked'],
								'_wpnonce'      => $_REQUEST['_wpnonce'],
							),
							network_admin_url( 'themes.php' )
						)
					)
				);
			}

			$paged = ( $_REQUEST['paged'] ) ? $_REQUEST['paged'] : 1;
			wp_redirect(
				add_query_arg(
					array(
						'deleted' => count( $themes ),
						'paged'   => $paged,
						's'       => $s,
					),
					network_admin_url( 'themes.php' )
				)
			);
			exit;
		default:
			$themes = isset( $_POST['checked'] ) ? (array) $_POST['checked'] : array();
			if ( empty( $themes ) ) {
				wp_safe_redirect( add_query_arg( 'error', 'none', $referer ) );
				exit;
			}
			check_admin_referer( 'bulk-themes' );

			/** This action is documented in wp-admin/network/site-themes.php */
			$referer = apply_filters( 'handle_network_bulk_actions-' . get_current_screen()->id, $referer, $action, $themes );

			wp_safe_redirect( $referer );
			exit;
	}
}

$wp_list_table->prepare_items();

add_thickbox();

add_screen_option( 'per_page' );

get_current_screen()->add_help_tab(
	array(
		'id'      => 'overview',
		'title'   => __( 'Overview' ),
		'content' =>
			'<p>' . __( 'This screen enables and disables the inclusion of themes available to choose in the Appearance menu for each site. It does not activate or deactivate which theme a site is currently using.' ) . '</p>' .
			'<p>' . __( 'If the network admin disables a theme that is in use, it can still remain selected on that site. If another theme is chosen, the disabled theme will not appear in the site&#8217;s Appearance > Themes screen.' ) . '</p>' .
			'<p>' . __( 'Themes can be enabled on a site by site basis by the network admin on the Edit Site screen (which has a Themes tab); get there via the Edit action link on the All Sites screen. Only network admins are able to install or edit themes.' ) . '</p>',
	)
);

get_current_screen()->set_help_sidebar(
	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
	'<p>' . __( '<a href="https://codex.wordpress.org/Network_Admin_Themes_Screen">Documentation on Network Themes</a>' ) . '</p>' .
	'<p>' . __( '<a href="https://wordpress.org/support/">Support Forums</a>' ) . '</p>'
);

get_current_screen()->set_screen_reader_content(
	array(
		'heading_views'      => __( 'Filter themes list' ),
		'heading_pagination' => __( 'Themes list navigation' ),
		'heading_list'       => __( 'Themes list' ),
	)
);

$title       = __( 'Themes' );
$parent_file = 'themes.php';

wp_enqueue_script( 'updates' );
wp_enqueue_script( 'theme-preview' );

require_once( ABSPATH . 'wp-admin/admin-header.php' );

?>

<div class="wrap">
<h1 class="wp-heading-inline"><?php echo esc_html( $title ); ?></h1>

<?php if ( current_user_can( 'install_themes' ) ) : ?>
	<a href="theme-install.php" class="page-title-action"><?php echo esc_html_x( 'Add New', 'theme' ); ?></a>
<?php endif; ?>

<?php
if ( isset( $_REQUEST['s'] ) && strlen( $_REQUEST['s'] ) ) {
	/* translators: %s: search keywords */
	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $s ) );
}
?>

<hr class="wp-header-end">

<?php
if ( isset( $_GET['enabled'] ) ) {
	$enabled = absint( $_GET['enabled'] );
	if ( 1 == $enabled ) {
		$message = __( 'Theme enabled.' );
	} else {
		$message = _n( '%s theme enabled.', '%s themes enabled.', $enabled );
	}
	echo '<div id="message" class="updated notice is-dismissible"><p>' . sprintf( $message, number_format_i18n( $enabled ) ) . '</p></div>';
} elseif ( isset( $_GET['disabled'] ) ) {
	$disabled = absint( $_GET['disabled'] );
	if ( 1 == $disabled ) {
		$message = __( 'Theme disabled.' );
	} else {
		$message = _n( '%s theme disabled.', '%s themes disabled.', $disabled );
	}
	echo '<div id="message" class="updated notice is-dismissible"><p>' . sprintf( $message, number_format_i18n( $disabled ) ) . '</p></div>';
} elseif ( isset( $_GET['deleted'] ) ) {
	$deleted = absint( $_GET['deleted'] );
	if ( 1 == $deleted ) {
		$message = __( 'Theme deleted.' );
	} else {
		$message = _n( '%s theme deleted.', '%s themes deleted.', $deleted );
	}
	echo '<div id="message" class="updated notice is-dismissible"><p>' . sprintf( $message, number_format_i18n( $deleted ) ) . '</p></div>';
} elseif ( isset( $_GET['error'] ) && 'none' == $_GET['error'] ) {
	echo '<div id="message" class="error notice is-dismissible"><p>' . __( 'No theme selected.' ) . '</p></div>';
} elseif ( isset( $_GET['error'] ) && 'main' == $_GET['error'] ) {
	echo '<div class="error notice is-dismissible"><p>' . __( 'You cannot delete a theme while it is active on the main site.' ) . '</p></div>';
}

?>

<form method="get">
<?php $wp_list_table->search_box( __( 'Search Installed Themes' ), 'theme' ); ?>
</form>

<?php
$wp_list_table->views();

if ( 'broken' == $status ) {
	echo '<p class="clear">' . __( 'The following themes are installed but incomplete.' ) . '</p>';
}
?>

<form id="bulk-action-form" method="post">
<input type="hidden" name="theme_status" value="<?php echo esc_attr( $status ); ?>" />
<input type="hidden" name="paged" value="<?php echo esc_attr( $page ); ?>" />

<?php $wp_list_table->display(); ?>
</form>

</div>

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

include( ABSPATH . 'wp-admin/admin-footer.php' );