How do static methods call non-static methods in PHP classes?

Static methods in PHP classes call non-static methods: First, in the static method in the class, the object needs to be instantiated; then the method in the class is called, the code is [self::staticFun(); A:: staticFun()].

Static methods in PHP classes call non-static methods:

Non-static methods call static methods: Yesself or the class name plus :: is called

as in the following case:

<?php
class A{
    public function noneStaticFun(){
        echo  __CLASS__." none static function<br/>";
    }
    public static function staticFun(){
        echo __CLASS__." static function<br/>";
        //静态方法调用非静态方法，需要实例化对象然后再调用对象中的非静态方法
        (new A())->noneStaticFun();
    }
    public function testCallStaticFun(){
        echo "call static function<br/>";
        //调用本类的静态方法，使用 self关键字或者类名
        self::staticFun();
        //A::staticFun(); //也可以使用这种方式
        //调用其它类的静态方法，直接使用类名::方法名的形式调用
        B::myStaticFun();
    }
}
class B{
    public static function myStaticFun(){
        echo __CLASS__." static function<br/>";
    }
}
//演示
$testA = new A();
$testA->testCallStaticFun();
A::staticFun();

Running result:

call static function
A static function
A none static function
B static function
A static function
A none static function

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