Support » Plugin: W3 Total Cache » Fix for “Fatal error: Class ‘W3_Config'”

  • I saw a lot of reports here about the following error:

    Fatal error: Class ‘W3_Config’ not found in /wp-content/plugins/wptouch/core/class-cache-smash.php on line 96

    This error is not directly related to W3TC itself, but rather to the WPTouch plugin that is attempting to access the W3_Config class, which was removed in v0.9.5

    I think plugin developers should refrain from directly accessing the W3TC classes, and instead use the function w3_instance() since those classes might magically disappear in new releases, as what happened today.

    Anyway, here’s a workaround that you can use to fix this bug until something more permanent is added in the official plugin.

    Edit the file called w3-total-cache-api.php, and add the following at the end of it:

    if(!class_exists('W3_Config')) :
        class W3_Config extends \W3TC\Config {
            public function __construct($master = false, $blog_id = null) {
                return parent::__construct($blog_id);
            public function get_cache_option( $key, $default = null) {
                return parent::get( $key, $default );

    This should hopefully solve the problems with those of you who are using WPTouch.

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