wp_version_check

Source code

function wp_version_check() {

	if ( defined('WP_INSTALLING') )

		return;



	global $wpdb, $wp_local_package;

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

	$php_version = phpversion();



	$current = get_site_transient( 'update_core' );

	if ( ! is_object($current) ) {

		$current = new stdClass;

		$current->updates = array();

		$current->version_checked = $wp_version;

	}



	$locale = apply_filters( 'core_version_check_locale', get_locale() );



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

	$current->last_checked = time();

	set_site_transient( 'update_core', $current );



	if ( method_exists( $wpdb, 'db_version' ) )

		$mysql_version = preg_replace('/[^0-9.].*/', '', $wpdb->db_version());

	else

		$mysql_version = 'N/A';



	if ( is_multisite( ) ) {

		$user_count = get_user_count( );

		$num_blogs = get_blog_count( );

		$wp_install = network_site_url( );

		$multisite_enabled = 1;

	} else {

		$user_count = count_users( );

		$multisite_enabled = 0;

		$num_blogs = 1;

		$wp_install = home_url( '/' );

	}



	$query = array(

		'version'           => $wp_version,

		'php'               => $php_version,

		'locale'            => $locale,

		'mysql'             => $mysql_version,

		'local_package'     => isset( $wp_local_package ) ? $wp_local_package : '',

		'blogs'             => $num_blogs,

		'users'             => $user_count['total_users'],

		'multisite_enabled' => $multisite_enabled

	);



	$url = 'http://api.wordpress.org/core/version-check/1.6/?' . http_build_query( $query, null, '&' );



	$options = array(

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

		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),

		'headers' => array(

			'wp_install' => $wp_install,

			'wp_blog' => home_url( '/' )

		)

	);



	$response = wp_remote_get($url, $options);



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

		return false;



	$body = trim( wp_remote_retrieve_body( $response ) );

	if ( ! $body = maybe_unserialize( $body ) )

		return false;

	if ( ! isset( $body['offers'] ) )

		return false;

	$offers = $body['offers'];



	foreach ( $offers as &$offer ) {

		foreach ( $offer as $offer_key => $value ) {

			if ( 'packages' == $offer_key )

				$offer['packages'] = (object) array_intersect_key( array_map( 'esc_url', $offer['packages'] ),

					array_fill_keys( array( 'full', 'no_content', 'new_bundled', 'partial' ), '' ) );

			elseif ( 'download' == $offer_key )

				$offer['download'] = esc_url( $value );

			else

				$offer[ $offer_key ] = esc_html( $value );

		}

		$offer = (object) array_intersect_key( $offer, array_fill_keys( array( 'response', 'download', 'locale',

			'packages', 'current', 'php_version', 'mysql_version', 'new_bundled', 'partial_version' ), '' ) );

	}



	$updates = new stdClass();

	$updates->updates = $offers;

	$updates->last_checked = time();

	$updates->version_checked = $wp_version;

	set_site_transient( 'update_core',  $updates);

}