3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = "PHP 5"; $x++; echo $x + \n; $x = "PHP 5"; echo $x + 1;
Output for 8.3.0 - 8.3.4
Deprecated: Increment on non-alphanumeric string is deprecated in /in/qtPVk on line 3 Fatal error: Uncaught Error: Undefined constant "n" in /in/qtPVk:4 Stack trace: #0 {main} thrown in /in/qtPVk on line 4
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
Fatal error: Uncaught Error: Undefined constant "n" in /in/qtPVk:4 Stack trace: #0 {main} thrown in /in/qtPVk on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Undefined constant 'n' in /in/qtPVk:4 Stack trace: #0 {main} thrown in /in/qtPVk on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Undefined constant 'n' in /in/qtPVk on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/qtPVk on line 4 Notice: Use of undefined constant n - assumed 'n' in /in/qtPVk on line 4 01

preferences:
283.07 ms | 402 KiB | 455 Q