3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = 'Hello'; $stringLength = strlen($string); $bufferString = ''; for ($i = $stringLength; $i > 0; $i--) { $bufferString += $string[$i]; } echo $bufferString;
Output for 7.1.0
Notice: Uninitialized string offset: 5 in /in/d3Lac on line 8 Warning: A non-numeric value encountered in /in/d3Lac on line 8 Warning: A non-numeric value encountered in /in/d3Lac on line 8 Warning: A non-numeric value encountered in /in/d3Lac on line 8 Warning: A non-numeric value encountered in /in/d3Lac on line 8 Warning: A non-numeric value encountered in /in/d3Lac on line 8 Warning: A non-numeric value encountered in /in/d3Lac on line 8 0
Output for 5.2.10 - 5.6.28, 7.0.0 - 7.0.14
Notice: Uninitialized string offset: 5 in /in/d3Lac on line 8 0
Output for hhvm-3.12.0
0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.2.9
Notice: Uninitialized string offset: 5 in /in/d3Lac on line 8 0