3v4l.org

run code in 300+ PHP versions simultaneously
<?php for($j=0;$j<20;$j++){ $u="hello ".$u; } $b=explode("\n",$u); for($i=20;$i>=10;$i--){ $ssj=$b[$i]." ".$ssj; } echo $ssj;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Warning: Undefined variable $u in /in/v8v9c on line 5 Warning: Undefined variable $ssj in /in/v8v9c on line 14 hello hello hello hello hello hello hello hello hello hello
Output for 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined variable: u in /in/v8v9c on line 5 Notice: Undefined variable: ssj in /in/v8v9c on line 14 hello hello hello hello hello hello hello hello hello hello
Output for 7.3.32, 7.4.26
hello hello hello hello hello hello hello hello hello hello
preferences:
153.04 ms | 408 KiB | 5 Q