Calling a specific PHP function with Jquery & amp; Ajax

For me this is something new, so I am just researching this and trying to understand it. As you can see in the php script there are 2 functions and I am trying to call a specific one with jquery.

Now if I have one function then I can do it, but when I have 2 or more I am starting to get stuck. I suppose I could do this when I have 2 functions, but as soon as more variables are in play or more functions do I just make massive if statements in my php?

The problem is that when I attach a database to it, I would need to consider all inputs that can happen. How do I specify a specific php function when using jquery & ajax?

//function.php




//index.html
This text is going to change>
$(document).ready(function() { $('#calling').load(function() { $.ajax({ cache: false, type: "POST", url: "function.php", data: 'name=myname' success: function(msg) { $('#calling').html((msg)); } }); // Ajax Call }); //event handler }); //document.ready

You need to pass a parameter in, either via the data object or via a GET variable on the URL. Either:

url: "function.php?action=functionname"

or:

data: {
    name: 'myname',
    action: 'functionname'
}

Then in PHP, you can access that attribute and handle it:

if(isset($_POST['action']) && function_exists($_POST['action'])) {
    $action = $_POST['action'];
    $var = isset($_POST['name']) ? $_POST['name'] : null;
    $getData = $action($var);
    // do whatever with the result
}

Note:
a better idea for security reasons would be to whitelist the available functions that can be called, e.g.:

switch($action) {
    case 'functionOne':
    case 'functionTwo':
    case 'thirdOKFunction':
        break;
    default:
        die('Access denied for this function!');
}

Implementation example:

// PHP:
function foo($arg1) {
    return $arg1 . '123';
}

// ...
echo $action($var);

// jQuery:
data: {
    name: 'bar',
    action: 'foo'
},
success: function(res) {
    console.log(res); // bar123
}
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