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Thread: Copying Objects

  1. #1
    Senior Member
    Join Date
    Jan 2014
    Location
    Banglore
    Posts
    289

    Copying Objects

    PHP provides a method you can use to copy an object. The method is __clone,with two underscores. You can write your own __clone method in a class if you want to specify statements to run when the object is copied. If you don’t write your own, PHP uses it’s default __clone method that copies all the properties as is. The two underscores indicate that the clone method is a different type of method, and thus is called differently, as shown in the following example .

    For example, you could write the following class:

    class Car
    {
    private $gas = 0;
    private $color = “red”;
    function addGas($amount)
    {
    $this->gas = $this->gas + $amount;
    echo “$amount gallons added to gas tank”;
    }
    function __clone()
    {
    $this->gas = 0;
    }
    }
    Using this class, you could create an object and copy it as follows:

    $firstCar = new Car;
    $firstCar->addGas(10);
    $secondCar=clone $firstCar;
    After these statements, you have two cars:

     $firstCar: This car is red and contains 10 gallons of gas. The 10 gallons were added with the addGas method.
     $secondCar: This car is red, but contains 0 gallons of gas. The duplicate car is created using the __clone method in the Car class. This method sets gas to 0 and doesn’t set $color at all.

    If you did not have a __clone method in the Car class, PHP would use a default __clone method that would copy all the properties, making $secondCar both red and containing 10 gallons of gas.

  2. #2
    Senior Member
    Join Date
    Nov 2015
    Posts
    405

    Re: Copying Objects

    all post of you very useful. i will follow you

  3. #3
    Senior Member
    Join Date
    Jan 2016
    Location
    Mumbai
    Posts
    517

    Re: Copying Objects

    Very useful information every php developer.

    Deliver2inbox

 

 

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