3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( "x"[] );
Output for 5.5.0 - 5.5.12
Fatal error: Cannot use [] for reading in /in/EgjlG on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28
Parse error: syntax error, unexpected '[' in /in/EgjlG on line 4
Process exited with code 255.

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