<?php/** * 對象工廠 * @author flynetcn */class ObjectFactory{  private static $objSet = array();  /**   * 清空工廠中的對象   */  public function clear()  {    self::$objSet = array();  }  /**   * 在工廠中創建對象并將其返回   * 參數格式：$class_name, $class_param1, $class_param2, ...   */  public static function create()  {    $argc = func_num_args();    if ($argc <= 0) {      throw new Exception('params error', 1);    }    $args = func_get_args();    $class_name = array_shift($args);    $params = $args;    if (!$params) {      $class_sign = $class_name;    } else {      $param_sign = serialize($params);      if (strlen($param_sign) > 100) {        $param_sign = md5($param_sign);      }      $class_sign = $class_name.'@'.$param_sign;    }    if (isset(self::$objSet[$class_sign])) {      return self::$objSet[$class_sign];    }    $ref = new ReflectionClass($class_name);    if ($ref->hasMethod('__construct') && !empty($params)) {      $obj = $ref->newInstanceArgs($params);    } else {      $obj = $ref->newInstance();    }    self::$objSet[$class_sign] = $obj;    return $obj;  }}