How to get value from multidimensional array value

Question

    Array
(
    [updateCategories] => Array
        (
            [products] => Array
                (
                    [0] => Array
                        (
                            [cat_id] => 3
                            [position] => 2
                            [product_id] => 8
                        )

                    [1] => Array
                        (
                            [cat_id] => 4
                            [position] => 11
                            [product_id] => 8
                        )

                    [2] => Array
                        (
                            [cat_id] => 3
                            [position] => 4
                            [product_id] => 39
                        )

                    [3] => Array
                        (
                            [cat_id] => 4
                            [position] => 9
                            [product_id] => 8
                        )

                    [4] => Array
                        (
                            [cat_id] => 3
                            [position] => 6
                            [product_id] => 41
                        )

                    [5] => Array
                        (
                            [cat_id] => 11
                            [position] => 7
                            [product_id] => 8
                        )

The above array is my output array but I need to get all cat_id of product_id=8. How can I do this?

iterate over the array and find it...

user1646111
– user1646111

2013-07-17 11:53:35 +00:00
Commented Jul 17, 2013 at 11:53 — user1646111
– user1646111, Commented Jul 17, 2013 at 11:53

swapnesh · Accepted Answer · 2013-07-17 11:55:14Z

1

$newarr = array();
foreach( $arr['updateCategories']['products'] as $myarr)
{
  if($myarr['product_id'] == 8)
  $newarr[] =  $myarr['cat_id'];
}

answered Jul 17, 2013 at 11:55

swapnesh

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Comments

zavg · Accepted Answer · 2013-07-17 11:55:21Z

1

The simpliest solution is

$result = array();
foreach($yourArray['updateCategories']['products'] as $product)
  if($product['product_id] == 8)
    $product[] = $product['cat_id'];

where $yourArray is the array which dump you have published.

answered Jul 17, 2013 at 11:55

zavg

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Comments

Amal · Accepted Answer · 2013-07-17 11:55:54Z

1

Try something like this:

$arr = array();
foreach ($products as $key => $value) 
{
    if($value['product_id'] == 8) 
    {
        $arr[] = $key;

    }
}
print_r($arr); // <-- this should output the array of products with key as 8

answered Jul 17, 2013 at 11:55

Amal

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Comments

William Buttlicker · Accepted Answer · 2013-07-17 11:56:19Z

1

Use this

 foreach($array['updateCategories']['products'] as $product) {
      if(isset($product['product_id']) && $product['product_id']==8) {
        //do anything you want i am echoing
         echo $product['cat_id'];
    }
    }

answered Jul 17, 2013 at 11:56

William Buttlicker

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Comments

Austin Brunkhorst · Accepted Answer · 2013-07-17 11:56:40Z

1

You can use array_filter.

function filterProducts($product) {
    return ($product['product_id'] == 8);
}

$myProducts = array_filter(
    $myArray['updateCategories']['products'], 
    'filterProducts'
);

Where $myArray is the array displayed in your post.

answered Jul 17, 2013 at 11:56

Austin Brunkhorst

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1 Comment

zavg Over a year ago

But if you need just array of cat_ids as it is mentioned in question you have to iterate through all array again.

SubjectCurio · Accepted Answer · 2013-07-17 11:59:01Z

1

Can handle this by doing something like this

$matching_products = array();
foreach ($products as $key => $value) {
    if($value['product_id'] == 8) {
        $matching_products[] = $value['cat_id'];
    }
}

which'll leave you with an array of cat ids that have a product id of 8

edited Jul 17, 2013 at 11:59

answered Jul 17, 2013 at 11:53

SubjectCurio

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Comments

The Prophet · Accepted Answer · 2013-07-30 14:49:24Z

This should be able to retrieve all of the cat_id's from a given product_id. This function yields an object that can be iterated over to retrieve all the values it contains.

<?PHP 

    public function GetCatIdsByProductId($productId)
    {

        foreach($updateCategories=>products as $key=>$product)
        {
            if (isset($product=>product_id) && $product=>product_id == 8)
            {
                yield $product=>cat_id;
            }
        }
    }

    //Usage
    $catIds = GetCatIdsByProductId(8);
    var_dump($catIds);

A more generic version of this function can be constructed to retrieve a given key from a comparison on a given property value.

    public function GetPropertyByPropertyComparison(array $list, $propRet, $propCompare, $compValue)
    {

        foreach($list as $key=>$product)
        {
            if (isset($product=>{$propCompare}) && $product=>{$propCompare} == $compValue)
            {
                yield $product=>{$propRet};
            }
        }
    }

    //usage
    $cats = GetPropertyByPropertyComparison($updateCategories=>products, "cat_id", "product_id", 8);
    var_dump($cats);
?>

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