3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach([1 => 'test', 2 => 'test'] as $count=>$test){ ob_start(); echo $count; $cached = ob_get_contents(); ob_end_clean(); echo $cached; }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
12

preferences:
144.79 ms | 408 KiB | 5 Q