3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $str= aaa1; echo preg_replace("/[^0-9,.]/", "", $str);
Output for 7.2.0
Warning: Use of undefined constant aaa1 - assumed 'aaa1' (this will throw an Error in a future version of PHP) in /in/Lai5O on line 2 1
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant aaa1 - assumed 'aaa1' in /in/Lai5O on line 2 1