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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 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
array(3) { ["a"]=> bool(false) ["b"]=> bool(false) ["c"]=> string(5) "Valid" }
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_FUNCTION, expecting T_PAAMAYIM_NEKUDOTAYIM in /in/m3isD on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC in /in/m3isD on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC in /in/m3isD on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/m3isD on line 5
Process exited with code 255.

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