Drupal Commerce find the line item id by using product id

Programmatically find the line item id by using product id


function product_in_cart($product_id) {
  if (!is_array($product_id)) {
    global $user;
    $current_order = commerce_cart_order_load($user->uid);
    if (count($current_order->commerce_line_items) > 0) {
      $line_items = $current_order->commerce_line_items;
      foreach ($line_items['und'] as $key => $value) {
        $line_item = commerce_line_item_load($value['line_item_id']);
        $products = $line_item->commerce_product['und'];
        foreach ($products as $product_key => $product_value) {
          if ($product_id == $product_value['product_id']) {
            return $value['line_item_id'];
          }
        }
      }
      return -1;
    } else
      return -2;
  }
  else {
    global $user;
    $current_order = commerce_cart_order_load($user->uid);
    if (count($current_order->commerce_line_items) > 0) {
      $line_items = $current_order->commerce_line_items;
      foreach ($line_items['und'] as $key => $value) {
        $line_item = commerce_line_item_load($value['line_item_id']);
        $products = $line_item->commerce_product['und'][0]['product_id'];
        foreach ($product_id as $id) {
          if ($id == $products) {
            $line_item_ids[] = $value['line_item_id'];
          }
        }
      } if (isset($line_item_ids) >= 1) {
        return $line_item_ids;
      }
      else {
        return -1;
      }
    } else
      return -2;
  }
}