wp_update_themes

Source code

function wp_update_themes() {

	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version



	if ( defined( 'WP_INSTALLING' ) )

		return false;



	if ( !function_exists( 'get_themes' ) )

		require_once( ABSPATH . 'wp-includes/theme.php' );



	$installed_themes = get_themes( );

	$last_update = get_site_transient( 'update_themes' );

	if ( ! is_object($last_update) )

		$last_update = new stdClass;



	// Check for updated every 60 minutes if hitting update pages; else, check every 12 hours.

	$timeout = in_array( current_filter(), array( 'load-themes.php', 'load-update.php', 'load-update-core.php' ) ) ? 3600 : 43200;

	$time_not_changed = isset( $last_update->last_checked ) && $timeout > ( time( ) - $last_update->last_checked );



	$themes = array();

	$checked = array();

	$exclude_fields = array('Template Files', 'Stylesheet Files', 'Status', 'Theme Root', 'Theme Root URI', 'Template Dir', 'Stylesheet Dir', 'Description', 'Tags', 'Screenshot');



	// Put slug of current theme into request.

	$themes['current_theme'] = get_option( 'stylesheet' );



	foreach ( (array) $installed_themes as $theme_title => $theme ) {

		$themes[$theme['Stylesheet']] = array();

		$checked[$theme['Stylesheet']] = $theme['Version'];



		$themes[$theme['Stylesheet']]['Name'] = $theme['Name'];

		$themes[$theme['Stylesheet']]['Version'] = $theme['Version'];



		foreach ( (array) $theme as $key => $value ) {

			if ( !in_array($key, $exclude_fields) )

				$themes[$theme['Stylesheet']][$key] = $value;

		}

	}



	$theme_changed = false;

	foreach ( $checked as $slug => $v ) {

		$update_request->checked[ $slug ] = $v;



		if ( !isset( $last_update->checked[ $slug ] ) || strval($last_update->checked[ $slug ]) !== strval($v) )

			$theme_changed = true;

	}



	if ( isset ( $last_update->response ) && is_array( $last_update->response ) ) {

		foreach ( $last_update->response as $slug => $update_details ) {

			if ( ! isset($checked[ $slug ]) ) {

				$theme_changed = true;

				break;

			}

		}

	}



	if ( $time_not_changed && !$theme_changed )

		return false;



	// Update last_checked for current to prevent multiple blocking requests if request hangs

	$last_update->last_checked = time();

	set_site_transient( 'update_themes', $last_update );



	$options = array(

		'timeout' => ( ( defined('DOING_CRON') && DOING_CRON ) ? 30 : 3),

		'body'			=> array( 'themes' => serialize( $themes ) ),

		'user-agent'	=> 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);



	$raw_response = wp_remote_post( 'http://api.wordpress.org/themes/update-check/1.0/', $options );



	if ( is_wp_error( $raw_response ) || 200 != wp_remote_retrieve_response_code( $raw_response ) )

		return false;



	$new_update = new stdClass;

	$new_update->last_checked = time( );

	$new_update->checked = $checked;



	$response = unserialize( wp_remote_retrieve_body( $raw_response ) );

	if ( false !== $response )

		$new_update->response = $response;



	set_site_transient( 'update_themes', $new_update );

}