3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1,2,3); print_r($a[]);
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.22
Fatal error: Cannot use [] for reading in /in/8IBfh on line 3
Process exited with code 255.
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182 ms | 1395 KiB | 58 Q