3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = '12345'; $c = ''; for($i = 0; isset($a{$i}); $i++) { $c = $a{$i} . $c; } var_dump($c);
based on jd0QH
Output for 4.3.3 - 4.4.9, 5.0.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(5) "54321"
Output for 5.0.0 - 5.0.1
Notice: Uninitialized string offset: 5 in /in/q2Rv2 on line 5 string(5) "54321"
Output for 4.3.0 - 4.3.2
Notice: Uninitialized string offset: 5 in /in/q2Rv2 on line 4 string(5) "54321"