3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if ( ! preg_match("/^[".preg_quote('a-z 0-9~%.:_-')."]+$/i", $str)){ echo "Unallowed!!!!"; }else{ echo "Looks fine"; }
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: str in /in/WhTi3 on line 3 Unallowed!!!!
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: str in /in/WhTi3 on line 3 Unallowed!!!!