3v4l.org

run code in 300+ PHP versions simultaneously
<?php $userfile_name = null; $value = explode(".", $userfile_name); $file_ext = strtolower(array_pop($value)); echo $file_ext; ?>
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /in/q6dJa on line 3
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 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
preferences:
251.03 ms | 405 KiB | 377 Q