PHP类::为什么要声明为新的？ [关闭]

Question

I'm very new to php classes and I was wonder why do I need to declare it to a variable and set it as NEW?

Here is an example :

class myFirstClass {
    function Version(){
        return 'Version 1';
    }
    function Info(){
        return 'This class is doing nothing';
    }
}

$hola = new myFirstClass;

echo $hola->Version();

Why this won't work WITHOUT declare it to a variable and set it to NEW ?

In other words... Without this line :

$hola = new myFirstClass;

I'm so used to functions so it looks weird to me...

Answer 1

You are right! It is not necessary to use the new operator:

class myFirstClass {
    static function Version(){// static keyword
        return 'Version 1';
    }
    function Info(){
        return 'This class is doing nothing';
    }
}

echo myFirstClass::Version();// direct call