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<?php function validate_length($min = 1, $max = null) { return static function ($value = null) use ($min, $max) { $len = strlen($value); if (null !== $min && $len < $min) { return false; } if (null !== $max && $len > $max) { return false; } return $value; }; } $a = [ 'a' => 'value', 'b' => '', 'c' => 'Valid' ]; $result = filter_var_array ($a, [ 'a' => ['filter' => FILTER_CALLBACK, 'options' => validate_length(null, 4)], 'b' => ['filter' => FILTER_CALLBACK, 'options' => validate_length(1)], 'c' => ['filter' => FILTER_CALLBACK, 'options' => validate_length(1, 10)] ]); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> bool(false) ["b"]=> bool(false) ["c"]=> string(5) "Valid" }

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