3v4l.org

run code in 500+ PHP versions simultaneously
<?php $v1_d1 = 10; $v1_w2 = 20; $v1_d2 = 30; $v1_w3 = 40; $set = ['v1_d1', 'v1_w2', 'v1_d2', 'v1_w3']; foreach(compact(...$set) as $var) { echo $var; }
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 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
10203040
preferences:
80.06 ms | 1458 KiB | 4 Q