PHP关于传众多参数还是传上下文对象的性能测试-php手册-php.cn

PHP关于传众多参数还是传上下文对象的性能测试

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Release： 2016-06-13 11:31:34

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　　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>?>

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　　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。