How to get value from multidimensional array value - php

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?

Answer 1

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

Answer 2

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.

Answer 3

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

Answer 4

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'];
}
}

Answer 5

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.

Answer 6

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

Answer 7

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);
?>