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

Question

I have a multidimensional array with following values

$array = array( 
            0 => array (
               \"id\" => 1,
               \"parent_id\" =&         


        

Answer 1

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.