静态私有变量在它的类 php 中的可见性

Question

I have the following code:

myClass extends Class{

    private static $var1 = 0;

    public function index(){
        if(some condition){
            $this->var1 = 1;
        }
    }

    public function success(){
        if($this->var1 == 0){
            ...
        }else{
            ...
        }
    }

}
?>

My problem is that I cannot access the var1 from the functions in the class. What am I doing wrong here?

Answer 1

Static variables (and methods) are accessed using the :: operator. To access $var1 within the class, use the following code instead:

myClass extends Class{

private static $var1 = 0;

public function index(){

    if(some condition){
        static::$var1 = 1;
   }
}

public function success(){
    if(static::$var1 == 0){
     ...
    }else{
     ...
    }
} 

}