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

    How object references can make trouble

    Say payment is due 10 days after delivery. You copy the delivery date and add 10 days to it. If you do that by adding 10 days to the timestamp inside the due date, youíve also changed the delivery date, which probably isnít what you intended. The following is a recipe for confusion, if not disaster:

    $deliveryDate = new DateAndTime;
    $paymentDate = $deliveryDate;
    $paymentDate->addDays(10);
    If you thought that $paymentDate is now different from $deliveryDate, youíre right in PHP 4, but wrong in PHP 5.

    $deliveryDate = time()
    $paymentDate = $deliveryDate + 3600 * 24 * 10;
    The previous problemóthat both versions of the date changeódoesnít occur in this case. We got $paymentDate by adding to $deliveryDate, but $delivery-Date didnít change. And no matter what we do to one of them, the other will remain the same. They are separate copies. With objects in PHP 5, itís different .

    What we need is an API that lets us handle time points as if they were plain values. We want to do this:

    $deliveryDate = new DateAndTime;
    $paymentDate = $deliveryDate->addDays(10);

  2. #2
    Senior Member
    Join Date
    Jan 2016
    Location
    Mumbai
    Posts
    157

    Re: How object references can make trouble

    Very nice example for object references.

  3. #3
    Senior Member
    Join Date
    Dec 2015
    Location
    Mumbai
    Posts
    385

    Re: How object references can make trouble

    I agree with you this post.

    Rentalproxies

  4. #4
    Junior Member
    Join Date
    Aug 2016
    Posts
    1

    Re: How object references can make trouble

    it is nice

 

 

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