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run code in 150+ php & hhvm versions
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<?php $array = array( '13-2014' => 'z', '14-2014' => 'b', '6-2014' => 'a', '5-2014' => 'x' ); uksort($array, function($a, $b) { }); print_r($array);
Output for hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [13-2014] => z [14-2014] => b [6-2014] => a [5-2014] => x )
Output for 5.3.0 - 5.6.28
Array ( [5-2014] => x [6-2014] => a [14-2014] => b [13-2014] => z )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/raeXk on line 8
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 T_FUNCTION in /in/raeXk on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/raeXk on line 8
Process exited with code 255.