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如何巧妙运用PHP中的 stdClass

Jun 13, 2016 am 11:10 AM
php

一维数组,我现在特别喜欢把它写成对象,因为键盘打起来比较顺手,看起来也顺眼,如

  1. $andy = array();  

  2. $andy['a'] = 1;  

  3. $andy['b'] = 2;  

  4. $andy['c'] = 3; 

我喜欢把它变成这样

  1. $andy = array();  

  2. $andy = (object)$andy;  

  3. $andy->a = 1;  

  4. $andy->b = 2;  

  5. $andy->c = 3;  

新建空数组只要$andy = array();

新建空对像却要$andy = new Andy; 而且还得先有个class Andy{}
或者得2行

  1. $andy = array();  

  2. $andy = (object)$andy; 

用array直接改类型成object有点别扭,今天找到了答案,感谢phpx的兄弟

PHP stdClass的介绍

  1. $user = new stdClass();  

  2. $user->name = 'gouki';  

这样的代码,这是干嘛用的呢?

翻开手册,搜索stdClass,你会发现,手册上几乎没有介绍,如果你再次搜索google,看到的也几乎全是英文解释。
其实,stdClass在PHP5才开始被流行。而PHP stdClass也是zend的一个保留类。似乎没有其他作用。也几乎没有任何说明。

或者,我们可以这么理解:PHP stdClass是PHP的一个基类,所有的类几乎都继承这个类,所以任何时候都可以被new,可以让这个变量成为一个object。同时,这个基类又有一个特殊的地方,就是没有方法。
凡时用new stdClass()的变量,都不可能会出现$a->test()这种方式的使用。

或者,我们可以又这么理解一下,正因为PHP5的对象的独特性,对象在任何地方被调用,都是引用地址型的,所以相对消耗的资源会少一点。在其它页面为它赋值时是直接修改,而不是引用一个拷贝。

例如:

  1. $user = new stdClass();  

  2. $user->name = 'gouki';  

  3. $myUser = $user;  

  4. $myUser->name = 'flypig'

如果在PHP4时代,这样的代码就是在消耗系统资源。因为:

$myUser = $user;

这是创建了一个拷贝。所以,在PHP4的时候,都是这样使用:

$myUser = & $user;

有人说,为什么不用数组呢?数组不是更方便吗?而且对于PHP这样的弱类型程序来说,用数组应该是最方便的。
确实。数组在程序的使用中应该是最方便的,然而数组的每次被引用($a = $b),其实都是创建了一个副本,而且,数组被unset后,还是占用了内存(这个是听人说来的,我没有测试……也不知道怎么测试,如果有人知道,请告诉我,谢谢 )
不过SPL的标准类库里,还有一个函数arrayobject,可以直接将数组转化为对象这也是一个好办法哦。

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