Find the count of array with specific key and value in php [duplicate]

Question

I have a multidimensional array with following values

$array = array( 
            0 => array (
               "id" => 1,
               "parent_id" => 0
            ),            
            1 => array (
               "id" => 2,
               "parent_id" => 1
            ),            
            2 => array (
               "id" => 3,
               "parent_id" => 1,
            )
            3 => array (
               "id" => 4,
               "parent_id" => 0
            )
            4 => array (
               "id" => 5,
               "parent_id" => 3
            )
         );

I want to find the count of children for particular id. In my case, I want the results to be like

find_children($array, 1);
// output : 2

find_children($array, 3);
// output : 1

I know this is done by using for loop. Is there any PHP array functions exist for this function?

Yes. I did this by using for loop. But I want to know is there any PHP functions available for this — RaGu
– RaGu, Commented Oct 26, 2016 at 11:21

Hossam · Accepted Answer · 2018-11-04 10:21:02Z

3

You can use count with array_filter

function doSearch($id, array $array) {

    $arr = array_filter($array, function ($var) use ($id){
        if ($id === $var['parent_id']) {
           return true;
        }
    });

    return count($arr);
}

or shorter version

function doSearch($id, array $array) {
    return count(array_filter($array, function($var) use ($id) {
        return $id === $var['parent_id'];
    }));
}

So basically it gets elements where $id is equal to parent_id and returns their count

edited Nov 4, 2018 at 10:21

Hossam

1236 bronze badges

answered Oct 26, 2016 at 11:34

Robert

20.3k6 gold badges58 silver badges85 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

iainn · Accepted Answer · 2016-10-26 11:39:10Z

2

You could implement it using array_filter, to filter the array down to the elements that match a given parent id, and then return the count of the filtered array. The filter is provided a callback, which is run over each element of the given array.

function find_children($array, $parent) {
  return count(array_filter($array, function ($e) use ($parent) {
    return $e['parent_id'] === $parent;
  }));
}

find_children($array, 1);  // 2
find_children($array, 3);  // 1
find_children($array, 10); // 0

Whether or not you prefer this to a loop is a matter of taste.

edited Oct 26, 2016 at 11:39

answered Oct 26, 2016 at 11:26

iainn

17.4k9 gold badges38 silver badges45 bronze badges

3 Comments

Robert Over a year ago

set parent_id to false and invoke function for $parent = 0 and it will count it as well

iainn Over a year ago

@Robert Whoops, I meant to write the test as ===, I've updated the answer.

Robert Over a year ago

that's way === is recommended, so you are sure that value that someone provides is value that you expect

Collectives™ on Stack Overflow

Find the count of array with specific key and value in php [duplicate]

2 Answers 2

Comments

3 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

3 Comments

Linked

Related