If a post is updated, is the page's cache supposed to purge? (3 posts)

  1. gregorylam
    Posted 5 years ago #

    Hi, just a clarification on how W3 Total Cache behaves if a user goes into a published post/page and make a change.

    Is the page's cache designed to purge simultaneously, or is one expected to wait for changes to go "live" approximately around the time interval set in Page Cache / Cache Preload / Update Interval (or manually purge cache)?

    I ask this because I see the latter behaviour in a blog I manage. Thanks in advance!

  2. tnolte
    Posted 5 years ago #

    I was having the same issue and had my users complaining a lot about this. My solution was to build my own hook into 'save_post' to clear the cached page. Here is my code, which I added to my theme's 'functions.php'.

    ### Function: Clear W3TC Page/Post Cache Upon Edit
    $daybreak_cache_cleared = false;
    $daybreak_cache_cleared_flag = false;
    function daybreak_edit_clear_w3tc_cache( $post_id, $post ) {
        global $daybreak_cache_cleared;
        // verify if this is an auto save routine.
        // If it is our form has not been submitted, so we dont want to do anything
        if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
            return $post_id;
        if ( !$daybreak_cache_cleared_flag ) {
            $post_id = ( $parent_id = wp_is_post_revision( $post_id ) ) ? $parent_id : $post_id;
            if ( function_exists( 'w3tc_pgcache_flush_post' ) && $post->post_status == 'publish' ) {
                $daybreak_cache_cleared = w3tc_pgcache_flush_post( $post_id );
        $daybreak_cache_cleared_flag = true;
    add_action('save_post', 'daybreak_edit_clear_w3tc_cache', 10, 2);
    function daybreak_post_redirect_filter( $location, $post_id = null ) {
        global $daybreak_cache_cleared;
        if ( !$daybreak_cache_cleared ) {
            $location = add_query_arg( 'daybreak_message', 1, $location );
        } else {
            $location = add_query_arg( 'daybreak_message', 2, $location );
        return $location;
    add_filter('redirect_post_location', 'daybreak_post_redirect_filter', '99');
    function daybreak_post_admin_notices() {
        if ( !isset( $_GET['daybreak_message'] ) ) return;
        switch ( absint( $_GET['daybreak_message'] ) ) {
            case 1:
                $message = 'Problem clearing page cache or page cache doesn’t exist!';
                echo '<div id="notice" class="error fade"><p>' . $message . '</p></div>';
            case 2:
                $message = 'Cached page cleared.';
                echo '<div id="notice" class="updated fade"><p>' . $message . '</p></div>';
    add_action('admin_notices', 'daybreak_post_admin_notices');

    One thing that I also did was change my Page Cache from Disk Enhanced to Disk as there was some mention on forums that alluded to this also causing issues.

  3. Frederick Townes
    Posted 5 years ago #

    This issue randomly occurs for some users. Please submit a bug submission form from the support tab of the plugin if the problem persists.

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