array_filter with callback?

[Robert9]

Code:

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

I would like to make a check on " ";

Code:

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

How can I call checkElement?

Code:

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

does not work

Any idea?

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