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run code in 300+ PHP versions simultaneously
<?php for($j=0;$j<256;$j++){ for($i=0;$i<256;$i++){ $f='a'.chr($j).chr($i).'phpinfo'; if(function_exists($f)){ echo "$i\t$f\n"; } }} ?>

preferences:
37.64 ms | 402 KiB | 5 Q