1。__construct()
实例化对象时被调用,
当__construct和以类名为函数名的函数同时存在时,__construct将被调用,另一个不被调用。
2。__destruct()
当删除一个对象或对象操作终止时被调用。
3。__call()
对象调用某个方法,
若方法存在,则直接调用;
若不存在,则会去调用__call函数。
4。__get()
读取一个对象的属性时,
若属性存在,则直接返回属性值;
若不存在,则会调用__get函数。
5。__set()
设置一个对象的属性时,
若属性存在,则直接赋值;
若不存在,则会调用__set函数。
6。__toString()
打印一个对象的时被调用。如echo $obj;或print $obj;
7。__clone()
克隆对象时被调用。如:$t=new Test();$t1=clone $t;
8。__sleep()
serialize之前被调用。若对象比较大,想删减一点东东再序列化,可考虑一下此函数。
9。__wakeup()
unserialize时被调用,做些对象的初始化工作。
10。__isset()
检测一个对象的属性是否存在时被调用。如:isset($c->name)。
11。__unset()
unset一个对象的属性时被调用。如:unset($c->name)。
12。__set_state()
调用var_export时,被调用。用__set_state的返回值做为var_export的返回值。
13。__autoload()
实例化一个对象时,如果对应的类不存在,则该方法被调用。

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