PHP SPL-是否存在任何接口或类来控制在转换为数组时会发生什么？

Question

So by implementing Iterator , ArrayAccess , and Countable built-in interfaces, we have control over what happens inside an object when it's used in foreach loops or if a property is accessed as if it were an array index ( $object['id'] ).

For example, if you wanted, you could set it up so $object['version'] += 1 could automatically increment version field in the database.

What's missing is casting the object to array . Is there any interface or class that allows control over what happens when you do: (array) $object ? Any built-in interface or class at all, no matter how obscure? For example: if I wanted (array) $object to return $this->propertyArray instead of the normal object to array conversion of dumping all public object properties?

Note: something like requiring calling $object->toArray() by method name doesn't count, as the idea is to minimize the outside differences between an array and object as much as possible.

Answer 1

no there is not , because toArray() is not an magic function like __toString(); where casting works eg

$foo = (string) $myObect;

you have to specify toArray() and inside it return your array , may be in future __toArray() might come.

Answer 2

You could add a method like this

public function toArray() {
    return get_object_vars( $this );
}

See here . Or check SplFixedArray::toArray .