PHP Array same key for http_build_query

http_build_query_duplicate_key.php

<?php

/**
  * This is my first contribution in stack overflow!
  * https://stackoverflow.com/questions/17161114/php-http-build-query-with-two-array-keys-that-are-same/77402243#77402243
  */

function http_build_query_duplicate_key( array $array ) {
  $special_keys = [];
  foreach($array as $key => $value) {
    if (is_array($value) AND count($value) > 0) {
      if (array_is_list($value)) {
        foreach($value as $value_b) {
          if (is_array($value_b) AND !array_is_list($value_b)) {
            foreach($value_b as $key2 => $value2) {
              $special_keys[] = http_build_query_duplicate_key([$key.'['.$key2.']' => $value2]);
            }
          } else {
            $special_keys[] = http_build_query([$key => $value_b]);
          }
        }
      } else {
        $special_keys[] =  http_build_query_duplicate_key([$key => [$value]]);
      }
      unset($array[ $key ]);
    }
  }

  $and_symbol = '';
  if (count($array) > 0) {
    $and_symbol = '&';
  }

  return  implode('&', $special_keys) . $and_symbol . http_build_query($array);
}

$feed_params = array(
  'phone' => [
    'brand' => [
      'samsung' => [
        'galaxy' => ['S21', 'S22', 'S23'],
      ],
      'xiaomi' => [
        'redmi' => ['note 3','note 4', 'note 5'],
        'mi' => ['3','10'],
      ],
      'poco' => [
        'm' => ['3','4','5']
      ]
    ],
  ]
);

echo urldecode(http_build_query_duplicate_key($feed_params)) . PHP_EOL;
/** Output:
 * phone[brand][samsung][galaxy]=S21&
 * phone[brand][samsung][galaxy]=S22&
 * phone[brand][samsung][galaxy]=S23&
 * phone[brand][xiaomi][redmi]=note 3&
 * phone[brand][xiaomi][redmi]=note 4&
 * phone[brand][xiaomi][redmi]=note 5&
 * phone[brand][xiaomi][mi]=3&
 * phone[brand][xiaomi][mi]=10&
 * phone[brand][poco][m]=3&
 * phone[brand][poco][m]=4&
 * phone[brand][poco][m]=5
 */