3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $str = 'hello'; echo substr(-1);
based on j3NT9
Output for 5.3.0 - 7.2.0
Warning: substr() expects at least 2 parameters, 1 given in /in/s3rDp on line 4
Output for 4.3.0 - 5.2.17
Warning: Wrong parameter count for substr() in /in/s3rDp on line 4