array_filter with callback?

[Robert9]

            $newCustomFields = $this->filter('custom_fields', 'array');
            $newCustomFields = array_filter($newCustomFields);

I would like to make a check on " ";

    private function checkElement($var)
    {
       return trim($var) != '';
    }

How can I call checkElement?

$newCustomFields = array_filter($newCustomFields,'checkElement');

does not work

Any idea?

 

[Robert9]

No answer, but works for me:

$threadFields = $thread->custom_fields_;
$threadFields = array_filter($threadFields, function($val) {return ($val || is_numeric($val));});