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run code in 150+ php & hhvm versions
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<?php var_dump(ARRAY_FILTER_USE_KEY); $arr = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4]; var_dump(array_filter($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));
based on cXQkC
Output for 5.6.7 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(2) 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 - 5.5.35
Notice: Use of undefined constant ARRAY_FILTER_USE_KEY - assumed 'ARRAY_FILTER_USE_KEY' in /in/MVgNt on line 3 string(20) "ARRAY_FILTER_USE_KEY" array(2) { ["a"]=> int(1) ["b"]=> int(2) } Notice: Use of undefined constant ARRAY_FILTER_USE_KEY - assumed 'ARRAY_FILTER_USE_KEY' in /in/MVgNt on line 13 Warning: array_filter() expects at most 2 parameters, 3 given in /in/MVgNt on line 13 NULL Notice: Use of undefined constant ARRAY_FILTER_USE_BOTH - assumed 'ARRAY_FILTER_USE_BOTH' in /in/MVgNt on line 17 Warning: array_filter() expects at most 2 parameters, 3 given in /in/MVgNt on line 17 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/MVgNt on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/MVgNt on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/MVgNt on line 5
Process exited with code 255.