3v4l.org

run code in 500+ PHP versions simultaneously
<?php function foo(\Foo\Bar&\Foo\Baz $param = null) { var_dump($param); } foo(null);
Output for 8.2.11 - 8.2.34, 8.3.0 - 8.3.35
NULL
Output for 8.1.11 - 8.1.34
Fatal error: Cannot use null as default value for parameter $param of type Foo\Bar&Foo\Baz in /in/k0OjD on line 3
Process exited with code 255.
Output for 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Deprecated: foo(): Implicitly marking parameter $param as nullable is deprecated, the explicit nullable type must be used instead in /in/k0OjD on line 3 NULL
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