3v4l.org

run code in 300+ PHP versions simultaneously
<?php function ref(&$a) {} function val($a) {} $b = []; $a = $b['a']['b']; $a =& $b['a']['b']; ref($b['a']['b']); val($b['a']['b']); refn($b['a']['b']); valn($b['a']['b']);
Output for 8.3.0 - 8.3.6
Warning: Undefined array key "a" in /in/4hFQ5 on line 7 Warning: Trying to access array offset on null in /in/4hFQ5 on line 7 Fatal error: Uncaught Error: Call to undefined function refn() in /in/4hFQ5:12 Stack trace: #0 {main} thrown in /in/4hFQ5 on line 12
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Warning: Undefined array key "a" in /in/4hFQ5 on line 7 Warning: Trying to access array offset on value of type null in /in/4hFQ5 on line 7 Fatal error: Uncaught Error: Call to undefined function refn() in /in/4hFQ5:12 Stack trace: #0 {main} thrown in /in/4hFQ5 on line 12
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Notice: Undefined index: a in /in/4hFQ5 on line 7 Notice: Trying to access array offset on value of type null in /in/4hFQ5 on line 7 Fatal error: Uncaught Error: Call to undefined function refn() in /in/4hFQ5:12 Stack trace: #0 {main} thrown in /in/4hFQ5 on line 12
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Call to undefined function refn() in /in/4hFQ5:12 Stack trace: #0 {main} thrown in /in/4hFQ5 on line 12
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.31
Notice: Undefined index: a in /in/4hFQ5 on line 7 Fatal error: Uncaught Error: Call to undefined function refn() in /in/4hFQ5:12 Stack trace: #0 {main} thrown in /in/4hFQ5 on line 12
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Notice: Undefined index: a in /in/4hFQ5 on line 7 Fatal error: Call to undefined function refn() in /in/4hFQ5 on line 12
Process exited with code 255.

preferences:
182.44 ms | 402 KiB | 212 Q