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<?php function thing(array $needle, $haystack) { $haystack = array($haystack); foreach ($needle as $a) { $target = []; foreach ($haystack as $h) { $target = array_merge($target, explode($a, $h)); } $haystack = $target; } return $array_filter($haystack) + $needle; } var_dump(thing(array('THIS', 'test', 'hello', 'A', 'is'), 'helloTHISisAblindtest'));