How to call php function from ajax

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Hi
I have a php function and i need to call it from from jquery ajax to populate my datatable.

What I have tried:

my php file

PHP

public static function getEmployeesList() {
      $list = [];
      $dbConn = Connection::getInstance();
      $req = $dbConn->query('SELECT firstname,lastname,phone,email FROM employee');

      // we create a list of Post objects from the database results
      foreach($req->fetchAll() as $post) {
        $EmployeesList[] = new Post($post['firstname'], $post['lastname'], $post['phone'],$post['email']);
      }

      return $EmployeesList;
    }

jquery below

JavaScript

tblEmployees = $('#tblEmployees').dataTable({
        "oLanguage": { "sEmptyTable": "No data to display" },
        "bJQueryUI": false,
        "bAutoWidth": false,
        "sPaginationType": "full_numbers",
        "sAjaxSource": '../EmployeeService.php?method=getEmployeesList()',//problem is here.

Posted 8-Mar-16 22:21pm

Anele Ngqandu

Updated 9-Mar-16 0:58am

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Peter Leow · Answer 1 · 2016-03-09T00:58:00

Using plain PHP, you cannot call a PHP function directly, instead you send your request to a php script and pass it a parameter based on which then call the function that you want to invoke. For example:
in AJAX:

JavaScript

$.ajax({ url: 'phpscriptname.php',
         data: {function2call: 'getEmployeesList', otherkey:otherdata},
         type: 'post',
         success: function(output) {
                      alert(output);
         }
});

in phpscriptname.php:

C#

if(isset($_POST['function2call']) && !empty($_POST['function2call'])) {
    $function2call = $_POST['function2call'];
    switch($function2call) {
        case 'getEmployeesList' : getEmployeesList();break;
        case 'other' : // do something;break;
        // other cases
    }
}