Counting elements inside a multidimensional associative array

Question

So, I have the following data array in PHP

$array = array(
           "animal" => "panda",
           "location" => "San Diego",
           "age" => "2",            
         ),
         array(
           "animal" => "tiger",
           "location" => "Bronx",
           "age" => "5",            
         ),
         array(
           "animal" => "panda",
           "location" => "Bronx",
           "age" => "3",            
         ),
         array(
           "animal" => "tiger",
           "location" => "bronx",
           "age" => "3",            
         ),
         array(
           "animal" => "panda",
           "location" => "San Diego",
           "age" => "2",            
         )
)

What I want to do is convert this to an associative array that will contain a counter for animals, places and age. so if I wanted to see how many pandas are in san diego and age 2, I would get access to the new array with $newArray['panda']['San Diego']['2'], and the output would be 2.

My problem is that I can easily run the loop and build an array and count the elements when it is completely static.

foreach($array as $a) {

   $newArray[$a['animal']][$a['location']][$a['age']] += 1;

}

However, I want to know how to accomplish the same concept when the number of keys is dynamic. for example, what if in one call there is only a place and an animal, and sometimes in another call there can be a place, animal, age and gender.

, , , .

?

Answer 1

, . , , .

/**
 * @param array $animals The whole animals array
 * @param array $query Array containing keys and values you want to filter by
 *
 * @return array Animals that match $query
 */
function filterAnimals($animals, $query) {

    return array_filter($animals, function ($animal) use ($query) {
        // Check if $animal has every key and the corresponding value from $query
        foreach ($query as $key => $value) {
            if (!isset($animal[$key]) || $animal[$key] != $value) {
                return false;
            }
        }

        return true;
    });
}

filterAnimals() $animals , $query. pandas - :

$result = filterAnimals($animals, [
    'animal' => 'panda',
    'location' => 'San Diego'
]);

, , $result:

$count = count($result);