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

preferences:
39.76 ms | 402 KiB | 5 Q