3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo '<a href="mycgi?foo=', urlencode($userinput), '">';
Output for 5.0.4 - 5.6.30, hhvm-3.10.1, 7.0.0 - 7.2.0
<a href="mycgi?foo= Notice: Undefined variable: userinput in /in/oZquu on line 2 ">
Output for hhvm-3.11.1 - 3.17.3
<a href="mycgi?foo= Notice: Undefined variable: userinput in /in/oZquu on line 2 Warning: urlencode() expects parameter 1 to be string, null given in /in/oZquu on line 2 ">
Output for 4.3.0 - 5.0.3
<a href="mycgi?foo= Notice: Undefined variable: userinput in /in/oZquu on line 2 ">