3v4l.org

run code in 300+ PHP versions simultaneously
<?php $description = '<img src="http://web1.cz/obrazek.jpg">'; $description = preg_replace_callback('#<img(.*)src="(.*)"(.*)>#i', function($matches) { return '<img'.$matches[1].'src="img/'.base64_encode($matches[2]).'"'.$matches[3].'>'; }, $description); echo $description;
Output for 5.6.0 - 5.6.25, 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 - 7.4.29, 8.0.0 - 8.0.19, 8.1.0 - 8.1.6
<img src="img/aHR0cDovL3dlYjEuY3ovb2JyYXplay5qcGc=">

preferences:
56.25 ms | 410 KiB | 5 Q