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run code in 200+ php & hhvm versions
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<?php $mergeInfo = array(1 => 2 , 2 => 2 , 3 => 4); $campusAddressIds = array_filter(array_keys($mergeInfo) , function ($key) use ($mergeInfo) { return !in_array($key , $mergeInfo); }); print_r($campusAddressIds);
based on eX99U
Output for 5.3.0 - 7.3.0rc4
Array ( [0] => 1 [2] => 3 )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/pahWb on line 3
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/pahWb on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pahWb on line 3
Process exited with code 255.