PHP: How do i remove an element from a multidemision array?

Question

I have this code to add new elements to a multidimension array:

$this->shopcart[] = array(productID => $productID, items => $items);

So how do i remove an element from this array? I tried this code, but its not working:

public function RemoveItem($item)
{
    foreach($this->shopcart as $key)
    {
        if($key['productID'] == $item)
        {
            unset($this->shopcart[$key]);               
        }
    }
}

I get this error:

Warning: Illegal offset type in unset in C:\xampplite\htdocs\katrinelund\classes\TillRepository.php on line 50

The first code sample might misses some '-s around the keys. — erenon
– erenon, Commented Nov 10, 2009 at 17:06

David Kuridža · Accepted Answer · 2009-11-10 17:50:55Z

7

public function RemoveItem($item)
{
        foreach($this->shopcart as $i => $key)
        {
                if($key['productID'] == $item)
                {
                        unset($this->shopcart[$i]);   
                        break;                        
                }
        }
}

That should do the trick.

Update

There is also an alternative way:

if ( false !== $key = array_search($item, $this->shopcart) )
{
    unset($this->shopcart[$key];
}

edited Nov 10, 2009 at 17:50

answered Nov 10, 2009 at 17:05

David Kuridža

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3 Comments

erenon Over a year ago

Upvote for the first example. Typo in the second: !== insted of !===, and the second one is much less readable; don't use it if it's possible.

David Kuridža Over a year ago

It's not a typo, take a look at php.net/manual/en/language.operators.comparison.php. Less readable? Well, that depends from coder to coder, personally I prefer it.

David Kuridža Over a year ago

Whoa! Ooops, you're right, have to start reading what I write twice before posting it. Thanks!

Kris · Accepted Answer · 2009-11-10 17:20:23Z

2

You're not enumerating over indices, but values there, to unset an array index, you have to unset it by index, not by value.

Also, If your array index is actually the productID you can eliminate the loop altogether:

public function RemoveItem($productID)
{
    if (isset($this->shopcart[$productID]))
    {
        unset($this->shopcart[$productID]);
    }
}

Your example doesn't show how you are adding items to $this->shopcart, but this may or may not be an option for you depending on the needs of your project. (i.e. not if you need to have seperate instances of the same productid in the cart).

answered Nov 10, 2009 at 17:20

Kris

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