PHP Static延迟静态绑定用法分析_php技巧

class A 
{ 
  public static function echoClass(){ 
    echo __CLASS__; 
  }
  public static function test(){ 
    self::echoClass();    
  }
}
class B extends A 
{    
  public static function echoClass() 
  { 
     echo __CLASS__; 
  } 
} 
B::test(); //输出A

class A 
{ 
  public static function echoClass(){ 
    echo __CLASS__; 
  } 
  public static function test() 
  { 
    static::echoClass();    
  } 
} 
class B extends A 
{    
  public static function echoClass(){ 
     echo __CLASS__; 
  } 
} 
B::test(); //输出B