static - php静态变量
我看到别人的代码
<code> static::$aliases[$root]</code>
类的开头定了了一个 staitc 变量
在类中 调用static 变量的话
难道不是 self::$aliases 么
static::$aliases
这个是为什么呢?
回复内容:
我看到别人的代码
<code> static::$aliases[$root]</code>
类的开头定了了一个 staitc 变量
在类中 调用static 变量的话
难道不是 self::$aliases 么
static::$aliases
这个是为什么呢?
这是PHP种的后期静态绑定(Late Static Binding)
的使用。static
和self
的区别主要是,如果使用self
,那么不管继承此类的子类如何重写覆盖静态方法,都会使用本类中定义的静态方法。而static
却相反,会以子类中重写覆盖的方法为准(如果子类没重写按继承链向上查找)。对于静态属性的使用也是如此。
http://php.net/manual/zh/language.oop5.late-static-bindings.php
static和self在继承的时候会有区别

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