PHP中靜態方法和非靜態方法的相互調用

在PHP的非靜態方法中可以調用靜態方法

class test{
    
    public static function strPrint(){
        echo 'this is strPrint static function<br>';
    }
    
    public function staticFuncInvoke(){
        self::strPrint();
    }
}

$test = new test();

$test->staticFuncInvoke();

上面的代碼會輸出: this is strPrint static function.

而下面的代碼會直接掛掉，php直接給出fatal error：

　　Fatal error: Using $this when not in object context in E:\htdocs\test\content.php on line 6

class test{
    
    public static function strPrint(){
        $this->staticFuncInvoke();
    }
    
    public function staticFuncInvoke(){
        echo 'this is a nonstatic function named staticFuncInvoke';
    }
}

test::strPrint();