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<?php $arr = array('hey' => 1, 'there' => 0, 'blimpie' => 2); $arr = array_keys(array_filter($arr), function($i) { return $i == 2; }); print_r($arr);
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, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Notice: Object of class Closure could not be converted to int in /in/GPOC1 on line 4 Notice: Object of class Closure could not be converted to int in /in/GPOC1 on line 4 Array ( [0] => hey )
Output for 7.3.32 - 7.3.33
Array ( [0] => hey )
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/GPOC1 on line 4
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/GPOC1 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/GPOC1 on line 4
Process exited with code 255.

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