PHP Object Clone Clone usage example _php tips

The example in this article describes the cloning clone usage of PHP objects. Share to everyone for your reference, specific as follows:

Shallow clones: Is simply a clone of a non-object, non-resource data, in which the property in the object is stored as an object type, the cloning is incomplete

<?php
class b{public
 $val = ten;
}
Class a{public
 $val =;
 public $b;
 Public Function __construct () {
  $this->b = new B ();
 }
}
$obj _a = new A ();
$obj _b = Clone $obj _a;
$obj _a->val =;
$obj _a->b->val =;
Var_dump ($obj _a);
Echo ' <br> ';
Var_dump ($obj _b);

The results of the operation are as follows:

Object (A) [1] public '
 val ' => int public
 ' B ' => 
 object (b) [2] public
  ' val ' => int

Object (A) [3] public '
 val ' => int to
 ' B ' => 
 object (b) [2] public
  ' Val ' => int 40

Deep Cloning: all attribute data for an object is copied thoroughly, and the Magic method is used to __clone () and to implement deep cloning inside

<?php
class b{public
 $val = ten;
}
Class a{public
 $val =;
 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 =;
$obj _a->b->val =;
Var_dump ($obj _a);
Echo ' <br> ';
Var_dump ($obj _b);

The results of the operation are as follows:

Object (A) [1] public '
 val ' => int public
 ' B ' => 
 object (b) [2] public
  ' val ' => int

Object (A) [3] public '
 val ' => int to
 ' B ' => 
 object (b) [4] public
  ' val ' => int 10

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I hope this article will help you with the PHP program design.