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1、class_alias--为一个类创建别名bool class_alias ( string $original , string $alias [, bool $autoload = TRUE ])基于用户定义的类 original 创建别名 alias。这个别名类和原有的类完全相同。成功时返回 TRUE，或者在失败时返回 FALSE。
2、on__construct($username,$age,$height,$weight){$this->username=$username;$this->age=$age;$this->height=$height;$this->weight=$weight;}publicfunction__set($name,$value){$this->$name=$value;}publicfunction__get($name){return$this->$name;}publicfunction__toS
3、tring(){return'';}}class_alias('Person','Pepole');$p_person=newPerson('zhaofei',23,185,72);var_dump($p_person);$p_pepole=newPepole('xiaoming',27,175,62);var_dump($p_pepole);//theobjectsarethesamevar_dump($p_person==$p_pepole,$p_person===$p_pepole);var_du
4、mp($p_personinstanceof$p_pepole);//theclassesarethesamevar_dump($p_personinstanceofPerson);var_dump($p_personinstanceofPepole);var_dump($p_pepoleinstanceofPerson);var_dump($p_pepoleinstanceofPepole);?>class_exists — 检查类是否已定义bool class_exists ( string $cl
5、ass_name [, bool $autoload =true ])检查指定的类是否已定义。username=$username;$this->age=$age;$this->height=$height;$this->weight
6、=$weight;}publicfunction__set($name,$value){$this->$name=$value;}publicfunction__get($name){return$this->$name;}publicfunction__toString(){return'';}}function__autoload($class){include($class.'.php');if(!class_exists($class)){trigger_error("Unabletoloadc
7、lass:$class",E_USER_WARNING);}}if(class_exists('Person')){$p_person=newPerson('zhaofei',23,185,72);var_dump($p_person);}?>get_called_class--后期静态绑定（"LateStaticBinding"）类的名称string get_called_class ( void )获取静态方法调用的类名。返回类的名称，如果不是在类中调用则返回 FALSE。
8、son{public$username;public$age;public$height;public$weight;staticpublic$number=0;publicfunction__construct($username,$age,$height,$weight){$this->username=$username;$this->age=$age;$this->height=$height;$this->weight=$weig
