expected to be a reference, value given in

Hi,

I’m just about to start my first WP-website and want to use the W3-Cache Plugin.
So far I’m very happy with the Plugin and its possibilities.

My site is

But on my Page it shows the following Warning:

Warning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /www/htdocs/w014984d/work-and-travel-tipps.de/wp-includes/functions.php on line 3549

In line 3549 the functions.php states the following:

/**
 * Flush all output buffers for PHP 5.2.
 *
 * Make sure all output buffers are flushed before our singletons are destroyed.
 *
 * @since 2.2.0
 */
function wp_ob_end_flush_all() {
	$levels = ob_get_level();
	for ($i=0; $i<$levels; $i++)
		ob_end_flush();
}

Line 3549 is the “ob_end_flush();” one.

If you need any more information to solve my problem please ask me 🙂

I’m using the PHP 7.0 (CGI) version on the server. Might that be an issue?

Thanks for your help.

https://ww.wp.xz.cn/plugins/w3-total-cache/