public、protected、private的区别，protectedprivate
通过className::functionNmae()、实例化、parent、self得出结论
className::functionNmae() 需是静态方法(public模式)
parent::functionNmae() 父类需是静态方法(public、protected两种模式)
self::functionNmae() 该类需是静态方法(三种模式)
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实例化：实例化后可访问public模式的静态方法或普通方法
一、直接访问（通过 className::functionNmae()和实例化）：
结论：
| 可以 通过 className::functionNmae() 访问
public
| 可以 通过实例 $obj->functionName() 访问
| 不可 通过 className::functionNmae() 访问
protected
| 不可 通过实例 $obj->functionName() 访问
| 不可 通过 className::functionNmae() 访问
private
| 不可 通过实例 $obj->functionName() 访问
<?<span>php
</span><span>/*</span><span>*
*
* @authors HG (hg0728@qq.com)
* @date 2015-05-26 17:12:02
* @version 1.0
</span><span>*/</span>
<span>header</span>("Content-type:text/html;charset=utf-8"<span>);
</span><span>class</span><span> A {
</span><span>static</span> <span>$name</span>='这是类A的静态变量'<span>;
</span><span>static</span> <span>public</span> <span>function</span><span> stc_pc(){
</span><span>echo</span> '这是类A的公共静态方法<br />'<span>;
}
</span><span>static</span> <span>function</span><span> stc(){
</span><span>echo</span> '这是类A的静态方法<br />'<span>;
}
</span><span>static</span> <span>protected</span> <span>function</span><span> stc_pd(){
</span><span>echo</span> '这是类A受保护的静态方法<br />'<span>;
}
</span><span>static</span> <span>private</span> <span>function</span><span> stc_pe(){
</span><span>echo</span> '这是类A私有的静态方法<br />'<span>;
}
}
A</span>::stc_pc();<span>//</span><span>可访问</span>
<span>
A</span>::stc();<span>//</span><span>可访问</span>
<span>
A</span>::<span>$name</span>;<span>//</span><span>不报错
//A::stc_pd();//不可访问
//A::stc_pe();//不可访问</span>
<span>echo</span> '<br><br>通过实例化访问<br><br>'<span>;
</span><span>$a</span> = <span>new</span><span> A();
</span><span>$a</span>->stc_pc();<span>//</span><span>可访问</span>
<span>$a</span>->stc();<span>//</span><span>可访问
//$a->$name;//报错
//$a->stc_pd();//不可访问
//$a->stc_pe();//不可访问</span>
<span>/*</span><span>*******************
| 可以 通过 className::functionNmae() 访问
public |
| 可以 通过实例 $obj->functionName() 访问
| 不可 通过 className::functionNmae() 访问
protected |
| 不可 通过实例 $obj->functionName() 访问
| 不可 通过 className::functionNmae() 访问
private |
| 不可 通过实例 $obj->functionName() 访问
*******************</span><span>*/</span>二、直接访问（self::functionNmae()）
结论：
self::functionNmae();需是静态方法(三种模式都可)
<?<span>php
</span><span>/*</span><span>*
*
* @authors HG (hg0728@qq.com)
* @date 2015-05-26 17:18:50
* @version 1.0
</span><span>*/</span>
<span>header</span>("Content-type:text/html;charset=utf-8"<span>);
</span><span>class</span><span> C {
</span><span>static</span> <span>$name</span> = "静态变量"<span>;
</span><span>static</span> <span>public</span> <span>function</span><span> stc_pc(){
</span><span>echo</span> '静态公共方法<br>'<span>;
self</span>::<span>stc_pd();
self</span>::<span>stc_pe();
self</span>::<span>stc();
</span><span>//</span><span>self::func();//报错但有结果</span>
<span>
}
</span><span>static</span> <span>protected</span> <span>function</span><span> stc_pd(){
</span><span>echo</span> '静态受保护方法<br>'<span>;
}
</span><span>static</span> <span>private</span> <span>function</span><span> stc_pe(){
</span><span>echo</span> '静态受保护方法<br>'<span>;
}
</span><span>static</span> <span>function</span><span> stc(){
</span><span>echo</span> '静态普通方法<br>'<span>;
}
</span><span>function</span><span> func(){
</span><span>echo</span> '普通方法<br>'<span>;
}
}
C</span>::<span>stc_pc();
</span><span>/*</span><span>*****
self::functionNmae();需是静态方法(三种模式都可)
*****</span><span>*/</span>
三、通过子类访问父类（parent::functionNmae()和实例化）
结论：
parent::functionNmae(); private不可访问
$obj->functionNmae(); private不可访问
<?<span>php
</span><span>/*</span><span>*
*
* @authors HG (hg0728@qq.com)
* @date 2015-05-26 17:18:50
* @version 1.0
</span><span>*/</span>
<span>header</span>("Content-type:text/html;charset=utf-8"<span>);
</span><span>include</span> '/class_a.php'<span>;
</span><span>class</span> B <span>extends</span><span> A{
</span><span>static</span> <span>public</span> <span>function</span><span> index(){
parent</span>::<span>stc_pc();
parent</span>::<span>stc();
parent</span>::<span>stc_pd();
parent</span>::<span>$name</span>;<span>//</span><span>不报错
//parent::stc_pe();//不可访问</span>
<span>echo</span> '<br><br>通过实例化访问<br><br>'<span>;
</span><span>$a</span> = <span>new</span><span> A();
</span><span>$a</span>-><span>stc_pc();
</span><span>$a</span>-><span>stc();
</span><span>$a</span>-><span>stc_pd();
</span><span>$a</span>-><span>$name</span>;<span>//</span><span>报错
//$a->stc_pe();//不可</span>
<span> }
}
B</span>::<span>index();
</span><span>/*</span><span>*****
在子类中通过:
parent::functionNmae(); private不可访问
$obj->functionNmae(); private不可访问
*****</span><span>*/</span>
