3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = []; $b = implode(',', $a); var_dump($b);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
string(0) ""
preferences:
160.87 ms | 404 KiB | 204 Q