Why is a method with the same name as the class being called automatically?

Question

EDIT: Title edited to make it more useful. Originally I had no idea that it was the use of a shared word that was causing the problem.

This is very basic but rather

Answer 1

Both methods get called, when you create a new instance of this class, because the methods have the same name as the class itself and so they are the constructor of this class:

class Hello
{
        public function hello()
    {
        echo "Hello";
    }
}

class World
{
    public function world()
    {
        echo " World";
    }
}

So when you took an instance from both classes, both constructors got called.

Now when you renamed both methods to hello only 1 method was counted as constructor and the other one was a normal method in the other class. That's why you only saw Hello as output.

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But don't use the name of the class as constructor! It will be deprecated in PHP 7. Use __construct().