The expression return explode(' ', $this->body) returns the type string[] which is incompatible with the return type mandated by Illuminate\Contracts\Support\Arrayable::toArray() of Illuminate\Contracts\Support\TValue[].
In the issue above, the returned value is violating the contract defined by the
mentioned interface.
Let's take a look at an example:
interfaceHasName{/** @return string */publicfunctiongetName();}className{public$name;}classUserimplementsHasName{/** @return string|Name */publicfunctiongetName(){returnnewName('foo');// This is a violation of the ``HasName`` interface// which only allows a string value to be returned.}}
This function has been deprecated. The supplier of the function has supplied an explanatory message.
The explanatory message should give you some clue as to whether and when the function will be removed and what other function to use instead.