3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach ($GLOBALS['dummy'] as $k => $v) $v[0]++; unset($v);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined global variable $dummy in /in/W1TCI on line 3 Warning: foreach() argument must be of type array|object, null given in /in/W1TCI on line 3
Output for 8.0.0 - 8.0.30
Warning: Undefined array key "dummy" in /in/W1TCI on line 3 Warning: foreach() argument must be of type array|object, null given in /in/W1TCI on line 3
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: dummy in /in/W1TCI on line 3 Warning: Invalid argument supplied for foreach() in /in/W1TCI on line 3
Output for 7.3.32 - 7.3.33
Warning: Invalid argument supplied for foreach() in /in/W1TCI on line 3
preferences:
289.65 ms | 401 KiB | 330 Q