Cloning clone of PHP

Shallow clone: Only non-object non-resource data in the cloned object, that is, the object's property is stored in the object type, the clone will appear incomplete

    
     classB{public$val = 10;}classA{public$val = 20;    public$b;    publicfunction__construct(){$this->b = new B();    }}$obj_a = new A();$obj_b = clone$obj_a;$obj_a->val = 30;$obj_a->b->val = 40;var_dump($obj_a);echo'
';var_dump($obj_b);

Deep Clone: All property data for an object is completely duplicated, requires a magic method __clone (), and a deep clone inside it

    
     classB{public$val = 10;}classA{public$val = 20;    public$b;    publicfunction__construct(){$this->b = new B();    }    publicfunction__clone(){$this->b = clone$this->b;    }}$obj_a = new A();$obj_b = clone$obj_a;$obj_a->val = 30;$obj_a->b->val = 40;var_dump($obj_a);echo'
';var_dump($obj_b);

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The above introduces the cloning clone of PHP, including the content, I hope that the PHP tutorial interested in a friend helpful.

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