3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(int $bar = null) {echo "foo";} foo(null);
Output for 8.4.1 - 8.4.12
Deprecated: foo(): Implicitly marking parameter $bar as nullable is deprecated, the explicit nullable type must be used instead in /in/MG1WU on line 3 foo
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25
foo

preferences:
139.62 ms | 409 KiB | 5 Q