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<?php $arr = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4]; var_dump(array_filter($arr, function($v) { return $v < 3; })); var_dump(array_filter($arr, function($k) { return $k == 'b'; }, ARRAY_FILTER_USE_KEY)); var_dump(array_filter($arr, function($v, $k) { return $k == 'b' || $v == 4; }, ARRAY_FILTER_USE_BOTH));
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { ["a"]=> int(1) ["b"]=> int(2) } array(1) { ["b"]=> int(2) } array(2) { ["b"]=> int(2) ["d"]=> int(4) }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38
array(2) { ["a"]=> int(1) ["b"]=> int(2) } Notice: Use of undefined constant ARRAY_FILTER_USE_KEY - assumed 'ARRAY_FILTER_USE_KEY' in /in/cXQkC on line 11 Warning: array_filter() expects at most 2 parameters, 3 given in /in/cXQkC on line 11 NULL Notice: Use of undefined constant ARRAY_FILTER_USE_BOTH - assumed 'ARRAY_FILTER_USE_BOTH' in /in/cXQkC on line 15 Warning: array_filter() expects at most 2 parameters, 3 given in /in/cXQkC on line 15 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/cXQkC 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 '[' in /in/cXQkC on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/cXQkC on line 3
Process exited with code 255.
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