3v4l.org

run code in 300+ PHP versions simultaneously
<?php $k=0; for($i=1;$i<=4;$i++) { for($j=1;$j<$i;$j++) { echo "*"; } echo $k++; echo "\n"; }
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
0 *1 **2 ***3

preferences:
156.91 ms | 403 KiB | 167 Q