The use of array_reduce() on line 23 within the normalize() method will cause a "PHP Warning: WPGraphQLGutenberg\Blocks\Registry::WPGraphQLGutenberg\Blocks{closure}(): Argument #1 ($arr) must be passed by reference, value given" warning on PHP 8.0 because the callback is declared to expect the $arr parameter to be passed by reference.
Since PHP 8.0, any functions accepting callbacks that are not explicitly specified to accept parameters by reference - such as array_reduce() - will now warn if a callback with reference parameters is used, hence the reference in the function declaration is redundant and should be removed.
The use of
array_reduce()on line 23 within thenormalize()method will cause a "PHP Warning: WPGraphQLGutenberg\Blocks\Registry::WPGraphQLGutenberg\Blocks{closure}(): Argument#1($arr) must be passed by reference, value given" warning on PHP 8.0 because the callback is declared to expect the$arrparameter to be passed by reference.Since PHP 8.0, any functions accepting callbacks that are not explicitly specified to accept parameters by reference - such as
array_reduce()- will now warn if a callback with reference parameters is used, hence the reference in the function declaration is redundant and should be removed.