In PHP 8.4, declaring function or method parameters with a default value of `null` is deprecated if the type is not nullable.
PHP applications are recommended to ''explicitly'' declare the type as nullable. All type declarations that have a default value of `null`, but without declaring `null` in the type declaration, will emit a deprecation notice:
{{{
function test( array $value = null ) {}
}}}
`Deprecated: Implicitly marking parameter $value as nullable is deprecated, the explicit nullable type must be used instead`
**Recommended Changes**
Change the implicit nullable type declaration to a nullable type declaration, available since PHP 7.1:
{{{#!diff
- function test( string $test = null ) {}
+ function test( ?string $test = null ) {}
}}}
This commit updates the affected instances in core to use a nullable type declaration.
References:
* [https://wiki.php.net/rfc/deprecate-implicitly-nullable-types PHP RFC: Deprecate implicitly nullable parameter types]
* [https://php.watch/versions/8.4/implicitly-marking-parameter-type-nullable-deprecated PHP.Watch: PHP 8.4: Implicitly nullable parameter declarations deprecated]
Follow-up to [28731], [50552], [57337], [57985].
Props ayeshrajans, jrf, audrasjb, jorbin.
Fixes#60786.
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