How to group an array of associative arrays by key in PHP

Ini adalah function untuk group berdasarkan objek json yang kita mau, monggo di ambil saya juga dapat dari > https://ourcodeworld.com/articles/read/762/how-to-group-an-array-of-associative-arrays-by-key-in-php

<?php

/**
 * Function that groups an array of associative arrays by some key.
 * 
 * @param {String} $key Property to sort by.
 * @param {Array} $data Array that stores multiple associative arrays.
 */
function group_by($key, $data) {
    $result = array();

    foreach($data as $val) {
        if(array_key_exists($key, $val)){
            $result[$val[$key]][] = $val;
        }else{
            $result[""][] = $val;
        }
    }

    return $result;
}

////////////////////////////////////////////////////////////////////////
example array:
<?php 

$data = array(
    array(
        "id" => 1,
        "name" => "Bruce Wayne",
        "city" => "Gotham",
        "gender" => "Male"
    ),
    array(
        "id" => 2,
        "name" => "Thomas Wayne",
        "city" => "Gotham",
        "gender" => "Male"
    ),
    array(
        "id" => 3,
        "name" => "Diana Prince",
        "city" => "New Mexico",
        "gender" => "Female"
    ),
    array(
        "id" => 4,
        "name" => "Speedy Gonzales",
        "city" => "New Mexico",
        "gender" => "Male"
    )
);

///////////////////////////////////////////////
usage :
<?php

// Group data by the "gender" key 
$byGroup = group_by("gender", $data);

// Dump result
echo "<pre>" . var_export($byGroup, true) . "</pre>";