Dynamically remove very nested array by key. This can remove key in array, no matter how deep It was.

unset_array_by_key.php

/**
 * Unset given key from array.
 *
 * @param  array  $array
 * @param  mixed  $parents
 * @param  string  $glue
 * @return void
 */
function array_unset_value(&$array, $parents, $glue = '.')
{
    if (!is_array($parents)) {
        $parents = array_filter(explode($glue, $parents), 'strlen');
    }

    $key = array_shift($parents);

    if (empty($parents)) {
        unset($array[$key]);
    } elseif (is_array($array) && array_key_exists($key, $array)) {
        if (!is_array($array[$key])) {
            array_unset_value($array[$key], $parents);
        } elseif (array_key_exists(0, $array[$key])) {
            foreach ($array[$key] as &$arr) {
                $arrr = isset($arr[$key]) && is_array($arr[$key]) ? $arr[$key] : $arr;
                array_unset_value($arrr, $parents);
                $arr = $arrr;
            }
        } else {
            array_unset_value($array[$key], $parents);
        }
    }
}