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<?php $x = array('a'=>1, 'b'=>2); $z = array_filter($x, function(&$val){ $val = $val%2; return $val; }); var_dump($x,$z);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: {closure}(): Argument #1 ($val) must be passed by reference, value given in /in/YMj7P on line 3 Warning: {closure}(): Argument #1 ($val) must be passed by reference, value given in /in/YMj7P on line 3 array(2) { ["a"]=> int(1) ["b"]=> int(2) } array(1) { ["a"]=> int(1) }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array(2) { ["a"]=> int(1) ["b"]=> int(2) } array(1) { ["a"]=> int(1) }
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
array(2) { ["a"]=> int(1) ["b"]=> int(0) } array(1) { ["a"]=> int(1) }
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/YMj7P 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/YMj7P on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/YMj7P on line 3
Process exited with code 255.

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