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<?php $a = function ($arguments, $str) { if (!is_string($str)) { return $str; } return strtolower($str); }; var_dump($a('AAA'));
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed in /in/Ed8pB on line 11 and exactly 2 expected in /in/Ed8pB:3 Stack trace: #0 /in/Ed8pB(11): {closure}('AAA') #1 {main} thrown in /in/Ed8pB on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20
Warning: Missing argument 2 for {closure}(), called in /in/Ed8pB on line 11 and defined in /in/Ed8pB on line 3 Notice: Undefined variable: str in /in/Ed8pB on line 4 Notice: Undefined variable: str in /in/Ed8pB on line 5 NULL
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_FUNCTION in /in/Ed8pB on line 3
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_FUNCTION in /in/Ed8pB on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Ed8pB on line 3
Process exited with code 255.

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