3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $str = 'foo o a a'; $str = preg_replace('/\s\s+/g', ' ', $str); // This will be 'foo o' now echo $str;
based on cOYi6
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Unknown modifier 'g' in /in/HM9hH on line 4
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/HM9hH on line 4