3v4l.org

run code in 300+ PHP versions simultaneously
<?php $value = 'a, moder php framework.= is a must 1234'; $output = preg_replace('/[^a-zA-z\d]/', '_', $value); echo $output;
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
a__moder__php_framework___is_a_must_1234

preferences:
191.03 ms | 403 KiB | 287 Q