wp_update_plugins

Source code

function wp_update_plugins() {

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



	if ( defined('WP_INSTALLING') )

		return false;



	// If running blog-side, bail unless we've not checked in the last 12 hours

	if ( !function_exists( 'get_plugins' ) )

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



	$plugins = get_plugins();

	$active  = get_option( 'active_plugins', array() );

	$current = get_site_transient( 'update_plugins' );

	if ( ! is_object($current) )

		$current = new stdClass;



	$new_option = new stdClass;

	$new_option->last_checked = time();

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

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

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



	$plugin_changed = false;

	foreach ( $plugins as $file => $p ) {

		$new_option->checked[ $file ] = $p['Version'];



		if ( !isset( $current->checked[ $file ] ) || strval($current->checked[ $file ]) !== strval($p['Version']) )

			$plugin_changed = true;

	}



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

		foreach ( $current->response as $plugin_file => $update_details ) {

			if ( ! isset($plugins[ $plugin_file ]) ) {

				$plugin_changed = true;

				break;

			}

		}

	}



	// Bail if we've checked in the last 12 hours and if nothing has changed

	if ( $time_not_changed && !$plugin_changed )

		return false;



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

	$current->last_checked = time();

	set_site_transient( 'update_plugins', $current );



	$to_send = (object) compact('plugins', 'active');



	$options = array(

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

		'body' => array( 'plugins' => serialize( $to_send ) ),

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

	);



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



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

		return false;



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



	if ( false !== $response )

		$new_option->response = $response;

	else

		$new_option->response = array();



	set_site_transient( 'update_plugins', $new_option );

}