3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = $arr ? $arr : ['tac'->"tac"]; var_dump($arr);
Output for 5.4.0 - 5.4.30
Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR), expecting ']' in /in/U0K4Y on line 2
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '[' in /in/U0K4Y on line 2
Process exited with code 255.
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172.04 ms | 1399 KiB | 67 Q