3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function reverseString($string){ $len = strlen($string); for ($i = 0; $i < $len / 2; $i++) { $string[$i] = chr(ord($string[$i]) ^ ord($string[$len - $i])); $string[$len - $i] = chr(ord($string[$i]) ^ ord($string[$len - $i])); $string[$i] = chr(ord($string[$i]) ^ ord($string[$len - $i])); } return $string; } reverseString("ping");
Output for 5.2.12 - 5.6.28, 7.0.0 - 7.1.0
Notice: Uninitialized string offset: 4 in /in/QA42s on line 7 Notice: Uninitialized string offset: 4 in /in/QA42s on line 8
Output for hhvm-3.10.0 - 3.12.0
Output for 5.2.10 - 5.2.11
Notice: Uninitialized string offset: 4 in /in/QA42s on line 7 Notice: Uninitialized string offset: 4 in /in/QA42s on line 8 Notice: Uninitialized string offset: 4 in /in/QA42s on line 8
Output for 4.3.0 - 5.2.9
Notice: Uninitialized string offset: 4 in /in/QA42s on line 7 Notice: Uninitialized string offset: 4 in /in/QA42s on line 8