Online PHP editor | refs for jQ7K4

<?php $array = [ 'needle' => 'needle in haystack text', 'Need' => 'another needle', 'fine' => 'refined', 'found' => 'Foundation', '' => 'non-empty haystack', 'missing' => 'not here', 'This is 0 in a haystack!', ]; var_export( array_filter( $array, function($haystack, $needle) { return strpos($haystack, $needle) !== false; }, ARRAY_FILTER_USE_BOTH ) );