[Plugin: W3 Total Cache] w3tc_pgcache_flush function isn't flushing cache

Can you paste the code you’re using?

The function below is inside a class and is called by the class constructor. I get a valid return code but the page cache isn’t empty as far as I can tell.

function tw_flush_cache(){
		if ($_POST['tw_flush_cache']=='1'){
			if (function_exists('w3tc_pgcache_flush')) {
				w3tc_pgcache_flush();
				return 'w3';
			} else if (function_exists('wp_cache_clear_cache')) {
				wp_cache_clear_cache();
				return 'sc';
			}
		}
		return false;
	}

When/where is that called? It’s important to make W3TC is initialized.

The following is a rudimentary representation of where the function lives:
(..in the main php file of a WordPress plugin…)

class WpPluginClass{
	function WpPluginClass(){
		$this->tw_flush_cache();
	}
	function tw_flush_cache(){
		if ($_POST['tw_flush_cache']=='1'){
			if (function_exists('w3tc_pgcache_flush')) {
				w3tc_pgcache_flush();
				return 'w3';
			} else if (function_exists('wp_cache_clear_cache')) {
				wp_cache_clear_cache();
				return 'sc';
			}
		}
		return false;
	}
}

$nInst = new WpPluginClass();

The cache should be cleared when the configuration page of the plugin is saved and thus $_POST[‘tw_flush_cache’] is 1. The function returns ‘w3’ but the cache does not seem to be cleared.

So, how do I check W3TC’s initialization status?

I take it that logic working for WP Super Cache?