3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x=array(); $x[a,b]='1'; print_r($x);
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.19
Parse error: syntax error, unexpected ',', expecting ']' in /in/XmM7T on line 3
Process exited with code 255.
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182.76 ms | 1395 KiB | 55 Q