3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s=0; for($r=1; $s>=$r; $r++) { for($p=$s-$r; $p>=1; $p--) echo(" "); for($c=1; $c<=$r; $c++) print_r($c); for($x=$r-1; $x>=1; $x--) print_r($x); }

preferences:
35.89 ms | 402 KiB | 5 Q