The example in this article describes the usage of PHP object cloning clone. Share it with everyone for your reference, the details are as follows:
Shallow cloning: only clone the non-object non-resource data in the object, that is, the attributes in the object store the object type, then there will be incomplete cloning
<?php
class B{
public $val = 10;
}
class A{
public $val = 20;
public $b;
public function __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 '<br>';
var_dump($obj_b);
Run The results are as follows:
object(A)[1] public 'val' => int 30 public 'b' => object(B)[2] public 'val' => int 40 object(A)[3] public 'val' => int 20 public 'b' => object(B)[2] public 'val' => int 40
Deep cloning: All attribute data of an object are completely copied. You need to use the magic method __clone(), and implement deep cloning in it
<?php
class B{
public $val = 10;
}
class A{
public $val = 20;
public $b;
public function __construct(){
$this->b = new B();
}
public function __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 '<br>';
var_dump($obj_b);
The running results are as follows:
object(A)[1] public 'val' => int 30 public 'b' => object(B)[2] public 'val' => int 40 object(A)[3] public 'val' => int 20 public 'b' => object(B)[4] public 'val' => int 10
I hope this article will be helpful to everyone in PHP programming.
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