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PHP stdClass类使用详解

对于一维数组,通过PHP的stdClass类我们可以把他写成对象的形式

<p>$tmp = array();</p>$tmp['a'] = 1;<br />$tmp['b'] = 2;<br /><p>$tmp['c'] = 3;</p>

通过PHP的stdClass类写法:

<br />$tmp = new stdClass();<br />$tmp->a = 1;<br />$tmp->b = 2;<br /><p>$tmp->c = 3;</p>

新建空数组只要$tmp = array();

新建空对象只要$tmp = new stdClass();

其实,stdClass在PHP5才开始被流行。而stdClass也是zend的一个保留类。

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$a->test()这种方式的使用。或者,我们可以又这么理解一下,正因为PHP5的对象的独特性,对象在任何地方被调用,都是引用地址型的,所以相对消耗的资源会少一点。在其它页面为它赋值时是直接修改,而不是引用一个拷贝。例如:$user = new stdClass();
$user->name = 'gouki';
$myUser = $user;

$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。


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