Maison >développement back-end >tutoriel php >PHP关于传众多参数还是传上下文对象的性能测试_PHP教程
在开发微信公众平台平台的过程中,有这么几个参数总是需要传来传去,$userOpenId,$message,$time。
在整个程序的运行过程中,为了函数方便的处理,将这三个变量一直放在参数列表里。关于这点,我突然联想到在Android里面,总是有一个Context(上下文)对象传来传去的,现在我的理解是,Context里面存放了一些必要的数据,在整个程序执行的逻辑中都有可能被使用。
因此,我就思考了一下,我这个三个变量要不要包装成Context呢?性能上会不会有提升?
PHP的函数参数如果是变量的话,都是直接传变量的拷贝,如果是传对象的话,是传对象的指针。也就是说,如果定义了一个String,放到一个函数里去修改,如果不以返回值的形式返回的话,该变量没有被修改,被修改的是该变量的一个拷贝。如果是定义一个对象放到函数中去操作,修改的直接就是这个对象本身。
由上面的思考,我认为如果传对象的话,可能会更快一点(因为不需要复制)。于是,我写了如下代码来测试。
<?<span php </span><span //</span><span 程序开始</span> <span $time1</span> = <span microtime</span><span (); </span><span //</span><span 上下文环境的三个变量</span> <span $userOpenId</span> = "abcdefghijk"<span ; </span><span $message</span> = "我想要查询什么"<span ; </span><span $time</span> = <span time</span><span (); </span><span //</span><span 构建上下文对象</span> <span $context</span> = <span new</span> Context(<span $userOpenId</span>, <span $message</span>, <span $time</span><span ); </span><span //</span><span 循环次数</span> <span $timeOfLoop</span> = 5000<span ; </span><span for</span> (<span $i</span> = 1; <span $i</span> <= <span $timeOfLoop</span>; <span $i</span>++<span ) { </span><span //</span><span handleMessageByParams($userOpenId, $message, $time);</span> handleMessageByObject(<span $context</span><span ); } </span><span //</span><span 程序结束</span> <span $time2</span> = <span microtime</span><span (); </span><span //</span><span 耗时</span> <span echo</span> "cast:".(<span $time2</span> - <span $time1</span><span ); </span><span //</span><span 通过传参数的处理方法</span> <span function</span> handleMessageByParams(<span $userOpenId</span>, <span $message</span>, <span $time</span><span ) { </span><span echo</span> "working......[".<span $userOpenId</span>.<span $message</span>.<span $time</span>."]\n"<span ; </span><span //</span><span 100 0.00020699999999996 //1000 0.002683 //5000 0.011099</span> <span } </span><span //</span><span 通过传对象的处理方法</span> <span function</span> handleMessageByObject(<span $context</span><span ) { </span><span echo</span> "working......[".<span $context</span>->userOpenId.<span $context</span>->message.<span $context</span>-><span time</span>."]\n"<span ; </span><span //</span><span 100 0.00024099999999999 //1000 0.002897 //5000 0.014896</span> <span } </span><span //</span><span 上下文对象</span> <span class</span><span Context { </span><span public</span> <span $userOpenId</span> = <span null</span><span ; </span><span public</span> <span $message</span> = <span null</span><span ; </span><span public</span> <span $time</span> = <span null</span><span ; </span><span public</span> <span function</span> __construct(<span $userOpenId</span>, <span $message</span>, <span $time</span><span ) { </span><span $this</span>->userOpenId = <span $userOpenId</span><span ; </span><span $this</span>->message = <span $message</span><span ; </span><span $this</span>-><span time</span> = <span $time</span><span ; } } </span>?>
测试的结果我已经在注释中写出,单位是ms(毫秒)。可见,传Context反而变慢了一点。当然,考虑到这个上下文的环境也不可能在一次代码中传来传去传5000次,而且性能差异也是非常小的毫秒级,所以,使用上下文对象来传递必须的参数是一个更优雅的选择。