3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(key(array('1.1', => '1.1')));
Output for 5.4.0 - 5.4.21
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /in/01X0v on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.27
Parse error: syntax error, unexpected T_DOUBLE_ARROW, expecting ')' in /in/01X0v on line 4
Process exited with code 255.
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175.85 ms | 1395 KiB | 57 Q