PHP Object Clone Clone overview

PHP object replication, is a copy of the object's reference address, so use $objA = $objB this style, $objA and $OBJB will point to the same memory address. $objB can also be affected when the $obja is changed.

If we want to replicate $obja objects as $OBJB objects, what changes $objA after replication will not affect $OBJB. That is, $obja and $OBJB are two separate objects, but $OBJB's initial values are created by $obja, and the more efficient approach is to use the Clone () method.

$objB = Clone $objA;

The $objB value is an instance of the Clone () method changed in the $obja base plus the $obja case object.

When an object is copied, the references in all properties remain unchanged, point to the original variable, and if the __clone () method is defined, the __clone () method in the newly created object is invoked and can be used to modify the value of the property.

Example 1:clone Object

<?php  
class subclass{  
       
    private $name;  
    Private $age;  
       
    Public Function __construct () {  
        $this->name = ' fdipzone ';  
        $this->age = ' a ';  
    }  
       
    Public Function __clone () {  
        $this->name = ' xfdipzone ';  
        $this->age = ' i ';  
    }  
       
}  
       
       
Class myclass{public  
       
    $p 1;  
    Public $p 2;  
       
    Public Function __construct () {  
       
    } public  
       
    function __clone () {  
        $this->p1 = Clone $this->p1;  
    }  
       
}  
       
$obj = new MyClass ();  
$obj->P1 = new Subclass ();  
$obj->p2 = new Subclass ();  
       
$obj 2 = clone $obj;  
       
Echo ' <pre> ';  
Echo ' obj<br> ';  
Var_dump ($obj);  
Echo ' <br>obj2<br> ';  
Var_dump ($obj 2);  
echo ' OK ';  
Echo ' </pre> ';  
       
? >

The example above will output:

Obj  
object (MyClass) #1 (2) {  
  [P1]]=>  
  object (Subclass) #2 (2) {  
    [' name ': ' Subclass ':p rivate]=>  
    string (8) "Fdipzone"
    [' Age ': ' Subclass ':p rivate]=>  
    string (2) '
  }  
  [' P2 ']=>  
  object (Subclass) #3 (2) {  
    [] Name ': ' Subclass ':p rivate]=>  
    string (8) ' Fdipzone '
    [' age ': ' Subclass ':p rivate]=>  
    string (2) ' 30 '
  }  
}  
       
obj2  
object (MyClass) #4 (2) {  
  [' P1 ']=>  
  object (Subclass) #5 (2) {  
    [' name ' : "Subclass":p rivate]=>  
    string (9) "Xfdipzone"
    ["Age": "Subclass":p rivate]=>  
    string (2) "29"
  }  
  [' P2 ']=>  
  object (Subclass) #3 (2) {  
    [' name ': ' Subclass ':p rivate]=>  
    string (8) ' Fdipzone '
    [] Age ': ' Subclass ':p rivate]=>  
    string (2) '}  
}