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The return type of return $this; (Core23\SitemapBundle\Definition\DefintionManager) is incompatible with the return type declared by the interface Core23\SitemapBundle\Def...nterface::addDefinition of type self.
If you return a value from a function or method, it should be a sub-type of the
type that is given by the parent type f.e. an interface, or abstract method.
This is more formally defined by the
Lizkov substitution principle,
and guarantees that classes that depend on the parent type can use any instance
of a child type interchangably. This principle also belongs to the
for object oriented design.
Our function my_function expects a Post object, and outputs the author
of the post. The base class Post returns a simple string and outputting a
simple string will work just fine. However, the child class BlogPost which
is a sub-type of Post instead decided to return an object, and is
therefore violating the SOLID principles. If a BlogPost were passed to
my_function, PHP would not complain, but ultimately fail when executing the
strtoupper call in its body.
public function getAll(): array
private function add(string $code, SitemapDefinitionInterface $sitemap): DefintionManagerInterface