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run code in 150+ php & hhvm versions
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<?php $a = [1, 3 => "x", 2 => "y", PHP_MAX_INT => "z", "t"]; var_dump($a);
based on UD66o
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant PHP_MAX_INT - assumed 'PHP_MAX_INT' in /in/L6tPh on line 2 array(5) { [0]=> int(1) [3]=> string(1) "x" [2]=> string(1) "y" ["PHP_MAX_INT"]=> string(1) "z" [4]=> string(1) "t" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/L6tPh on line 2
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/L6tPh on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/L6tPh on line 2
Process exited with code 255.