如何在AJAX调用中调用php函数而不是php类

Question

Here is a very simple and silly question I'm going to ask:

I'm very new to PHP, I was wondering if there is a way to call just a function in a class of PHP by AJAX.

for instance something like this:

$.ajax({
        url:'newPHPClass.php/My_Function_Name'
        ...
});

So in php, it would be like:

<?php
class newPHPClass {
    function My_Function_Name(){

    }
}
?>

Why do I need this? So I wouldn't have like so many php files. Instead I'll have a single php class with different functions inside. It will look cleaner and less extra files.

I have used ASP.NET MVC C# before. and in ASP.NET I could just simply put my controller's name in the URL section of AJAX followed by / and then my function's name (which could be modified in my Global.asax.cs file).

Thanks.

Answer 1

<?php

$action = $_POST['action'];

class Foo {

    function execute($action) {
        switch($action) {
            case "method1":
                $this->doMethod1();
                break;
            case "method2":
                $this->doMethod2();
                break;
        }
    }

    function doMethod1() {
        echo "Foo::doMethod1";
    }

    function doMethod2() {
        echo "Foo::doMethod2";
    }
}

$foo = new Foo();
$foo->execute($action);

?>

And use foo.php?action=method1 as URL.

Answer 2

First of all you don't call functions or methods via AJAX, you make a request to a page. If you make an AJAX call to a PHP file like:

<?php
class newPHPClass {
    function My_Function_Name(){

    }
}
?>

nothing will be returned and nothing will happen server side other than allocating the space for that class and then immediately destroy it at the end of the request.

For your question: it doesn't really matter on the client side (Javascript) how you are going to manage the class and files organization: only one file is going to be requested by an AJAX call.

I'd suggest you to have at least two different files: the declaration of functions or classes and the file that manage the response. You need a bit a separation from execution and declaration, therefore I'd avoid things like:

class A { ... }
$a = new A;
$a->myMethod();

Depending on the AJAX output I'd go with something like this instead:

# class.php
class A {...}

# ajax.php
$a = new A;
$a->myMethod();

Finally a suggestion: don't use classes when they just don't make sense. Having a bunch of functions grouped inside a class doesn't really feel OOP to me. I think you are using classes with procedural code in mind. Therefore I would go with a file that declares a bunch of functions instead.