C:/xampp/htdocs/zen-cart/admin/includes/functions/database.php

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<?php
  function zen_db_perform($table, $data, $action = 'insert', $parameters = '', $link = 'db_link') {
    global $db;
    reset($data);
    if ($action == 'insert') {
      $query = 'insert into ' . $table . ' (';
      while (list($columns, ) = each($data)) {
        $query .= $columns . ', ';
      }
      $query = substr($query, 0, -2) . ') values (';
      reset($data);
      while (list(, $value) = each($data)) {
        switch ((string)$value) {
          case 'now()':
            $query .= 'now(), ';
            break;
          case 'null':
            $query .= 'null, ';
            break;
          default:
            $query .= '\'' . zen_db_input($value) . '\', ';
            break;
        }
      }
      $query = substr($query, 0, -2) . ')';
    } elseif ($action == 'update') {
      $query = 'update ' . $table . ' set ';
      while (list($columns, $value) = each($data)) {
        switch ((string)$value) {
          case 'now()':
            $query .= $columns . ' = now(), ';
            break;
          case 'null':
            $query .= $columns .= ' = null, ';
            break;
          default:
            $query .= $columns . ' = \'' . zen_db_input($value) . '\', ';
            break;
        }
      }
      $query = substr($query, 0, -2) . ' where ' . $parameters;
    }

    return $db->Execute($query);
  }

  function zen_db_insert_id() {
    return mysql_insert_id();
  }

  function zen_db_output($string) {
    return htmlspecialchars($string);
  }

  function zen_db_input($string) {
    return addslashes($string);
  }

  function zen_db_prepare_input($string, $trimspace = true) {
    if (is_string($string)) {
      if ($trimspace == true) {
        return trim(stripslashes($string));
      } else {
        return stripslashes($string);
      }
    } elseif (is_array($string)) {
      reset($string);
      while (list($key, $value) = each($string)) {
        $string[$key] = zen_db_prepare_input($value);
      }
      return $string;
    } else {
      return $string;
    }
  }