将重复元素组合为多维数组中的数组

Question

I was wondering when working with multimedional arrays, if a certain key is the same, is there a way to combine the contents of other keys into its own array if a certain key is the same?

Something like this:

// name is the same in both arrays
array(
    array(
        'name' => 'Pepsi',
        'store' => 'Over here',
        'number' => '1234567'
    ),
    array(
        'name' => 'Pepsi',
        'store' => 'Over here',
        'number' => '5556734'
    )
)

into something like this

array(
    array(
        'name' => 'Pepsi',
        'store' => array('Over here', 'Over here'),
        'number' => array('1234567', '5556734')
    )
)

The defining key is checking if the name element is the same for the other arrays.

Answer 1

Thanks to Gianni Lovece for her answer but I was able to develop a much simpler solution based on this problem. Just plug in the $result_arr to browse through and the $key you want to use as basis and it immediately outputs a multidimensional array with non-repeating values for repeating elements (see example below).

function multiarray_merge($result_arr, $key){

    foreach($result_arr as $val){
        $item = $val[$key];     
        foreach($val as $k=>$v){
            $arr[$item][$k][] = $v;
        }
    }

    // Combine unique entries into a single array
    // and non-unique entries into a single element
    foreach($arr as $key=>$val){
        foreach($val as $k=>$v){
            $field = array_unique($v);
            if(count($field) == 1){
                $field = array_values($field);
                $field = $field[0];
                $arr[$key][$k] = $field;
            } else {
                $arr[$key][$k] = $field;
            }
        }
    }
    return $arr;
}

For example, in the sample array for this question, running multiarray_merge($mysample, 'name') returns

array(
    'Pepsi' => array(
        'name' => 'Pepsi',
        'store' => 'Over here', // String: Not an array since values are not unique
        'number' => array('1234567', '5556734') // Array: Saved as array since values are unique
    )
);