3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $string = 'ab'; // unset($string[0]); $string[0] = NULL; var_dump($string);
Output for 7.1.0 - 7.2.0
Warning: Cannot assign an empty string to a string offset in /in/LEkNI on line 4 string(2) "ab"
Output for 4.3.0 - 7.0.20
string(2) "b"