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run code in 150+ php & hhvm versions
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<?php $num = "sinha"; $firstNames = array("abhas", "dipesh"); $fullnames = array_map(function($x) use ($num){ return $x ." " . $num;}, $firstNames); var_dump($fullnames);
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(11) "abhas sinha" [1]=> string(12) "dipesh sinha" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/7K22W on line 4
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, expecting ')' in /in/7K22W on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/7K22W on line 4
Process exited with code 255.