wp_cache_phase2() │ WPSCache 1.0

Hooks from the function

Return

null. Nothing (null).

Usage

wp_cache_phase2();

wp_cache_phase2() code WPSCache 2.0.1

wp-super-cache/wp-cache-phase2.php 
function wp_cache_phase2() {
	global $wp_cache_gzip_encoding, $super_cache_enabled, $cache_rebuild_files, $cache_enabled, $wp_cache_gmt_offset, $wp_cache_blog_charset;

	if ( $cache_enabled == false ) {
		wp_cache_debug( 'wp_cache_phase2: Caching disabled! Exit' );
		define( 'WPSCSHUTDOWNMESSAGE', __( 'Caching disabled. Page not cached.', 'wp-super-cache' ) );
		add_action( 'wp_footer', 'wpsc_shutdown_message' );
		return false;
	}

	if ( wp_cache_user_agent_is_rejected() ) {
		wp_cache_debug( 'wp_cache_phase2: No caching to do as user agent rejected.' );
		return false;
	}

	if ( ob_get_level() > 1 ) {
		global $wp_super_cache_late_init;
		wp_cache_debug( '***********************************************************************************' );
		wp_cache_debug( '* An extra output buffer has been detected. Check your plugins, themes,           *' );
		wp_cache_debug( '* mu-plugins, and other custom code as this may interfere with caching.           *' );

		if ( isset( $wp_super_cache_late_init ) && $wp_super_cache_late_init ) {
			wp_cache_debug( '* Late init is enabled. This allows third-party code to run before WP Super Cache *' );
			wp_cache_debug( '* sets up an output buffer. That code may have set up the output buffer.          *' );
		}
		wp_cache_debug( '***********************************************************************************' );
	}

	wp_cache_debug( 'In WP Cache Phase 2', 5 );

	$wp_cache_gmt_offset   = get_option( 'gmt_offset' ); // caching for later use when wpdb is gone. https://wordpress.org/support/topic/224349
	$wp_cache_blog_charset = get_option( 'blog_charset' );

	wp_cache_mutex_init();
	if ( function_exists( 'add_action' ) && ( ! defined( 'WPLOCKDOWN' ) || constant( 'WPLOCKDOWN' ) == '0' ) ) {
		wp_cache_debug( 'Setting up WordPress actions', 5 );

		add_action( 'template_redirect', 'wp_super_cache_query_vars' );
		add_filter( 'wp_redirect_status', 'wpsc_catch_http_status_code' );
		add_filter( 'status_header', 'wpsc_catch_status_header', 10, 2 );
		add_filter( 'supercache_filename_str', 'wp_cache_check_mobile' );

		wpsc_register_post_hooks();

		do_cacheaction( 'add_cacheaction' );
	}

	if ( wpsc_is_backend() ) {
		wp_cache_debug( 'Not caching wp-admin requests.', 5 );
		return false;
	}

	if ( wpsc_is_get_query() ) {
		wp_cache_debug( 'Supercache caching disabled. Only using wp-cache. Non empty GET request. ' . wpsc_dump_get_request(), 5 );
		$super_cache_enabled = false;
	}

	if ( defined( 'WPSC_VARY_HEADER' ) ) {
		if ( WPSC_VARY_HEADER != '' ) {
			header( 'Vary: ' . WPSC_VARY_HEADER );
		}
	} else {
		header( 'Vary: Accept-Encoding, Cookie' );
	}

	ob_start( 'wp_cache_ob_callback' );
	wp_cache_debug( 'Created output buffer', 4 );

	// restore old supercache file temporarily
	if ( ( $_SERVER['REQUEST_METHOD'] !== 'POST' && empty( $_POST ) ) && $super_cache_enabled && $cache_rebuild_files ) {
		$user_info = wp_cache_get_cookies_values();

		if ( empty( $user_info )
			|| true === apply_filters( 'do_createsupercache', $user_info )
		) {
			wpcache_do_rebuild( get_current_url_supercache_dir() );
		}
	}

	schedule_wp_gc();
}