3v4l.org

run code in 300+ PHP versions simultaneously
<?php x[] ='a'; x[] ='b';
Output for 7.0.0
Fatal error: Cannot use temporary expression in write context in /in/RKT0P on line 3
Process exited with code 255.
Output for 5.6.8 - 5.6.16
Fatal error: Cannot use [] for reading in /in/RKT0P on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.30
Parse error: syntax error, unexpected '[' in /in/RKT0P on line 3
Process exited with code 255.
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161.76 ms | 1399 KiB | 24 Q