flushing cache via cronjob

You don’t need WP to do that, just

* * * * * user_xyz echo 'flush_all' | netcat localhost 11211

More examples:
https://www.cyberciti.biz/faq/linux-unix-flush-contents-of-memcached-instance/

Hi Peter,

yes i could do this but i want to flush the cache with the same cronjob with which one i empty the autoptimize cache, because in the memcached cache are not existing .css and .js files and for that moment the site is “broken” until i flush the cache manually;)
So in this case i want to WP do that.

This is the code for the Cronjob:

if ( !wp_next_scheduled('autopt_cache') ) {
	wp_schedule_event( time(), 'weekly', 'autopt_cache' );
}

add_action('autopt_cache', 'autopt_cache_function');
function autopt_cache_function() {
	foreach (array("","js","css") as $scandirName) {
		$scan[$scandirName] = scandir(WP_CONTENT_DIR.'/cache/autoptimize/'.$scandirName);
	}

	foreach ($scan as $scandirName=>$scanneddir) {
		$thisAoCacheDir=rtrim(WP_CONTENT_DIR.'/cache/autoptimize/'.$scandirName,"/")."/";
		foreach($scanneddir as $file) {
			if(!in_array($file,array('.','..')) && strpos($file,'autoptimize_') !== false && is_file($thisAoCacheDir.$file)) {
				@unlink($thisAoCacheDir.$file);
			}
		}
	}
	@unlink(WP_CONTENT_DIR.'/cache/autoptimize/'."/.htaccess");
//here i want to flush the memcached cache
}

Best regards,
Harry

Ah, you’re referring to WP Cron.
You said cron, that is system cron for me.

It’s not as obvious as it sounds; in theory you either have a global $wp_ffpc, which is an object, or do a new WP_FFPC, but that requires the defaults to be passed. The global $wp_ffpc; should do it.

Once you have this, call
$wp_ffpc->backend->clear($p1, $p2);

$p1 is an optional post ID
$p2 is optional force, so

$wp_ffpc->backend->clear(null, false);
will trigger the set method, while

$wp_ffpc->backend->clear(null, true);
will always trigger a full cache flush.

If it doesn’t work, please get back to me.

Ah ok, sorry;)
This

if ( !wp_next_scheduled('autopt_cache') ) {
	wp_schedule_event( time(), 'weekly', 'autopt_cache' );
}

add_action('autopt_cache', 'autopt_cache_function');
function autopt_cache_function() {
	foreach (array("","js","css") as $scandirName) {
		$scan[$scandirName] = scandir(WP_CONTENT_DIR.'/cache/autoptimize/'.$scandirName);
	}

	foreach ($scan as $scandirName=>$scanneddir) {
		$thisAoCacheDir=rtrim(WP_CONTENT_DIR.'/cache/autoptimize/'.$scandirName,"/")."/";
		foreach($scanneddir as $file) {
			if(!in_array($file,array('.','..')) && strpos($file,'autoptimize_') !== false && is_file($thisAoCacheDir.$file)) {
				@unlink($thisAoCacheDir.$file);
			}
		}
	}
	@unlink(WP_CONTENT_DIR.'/cache/autoptimize/'."/.htaccess");
global $wp_ffpc;
$wp_ffpc->backend->clear(null, true);
}

doesn’t work for now.