如何将值从jQuery-AJAX函数发送到PHP文件并在PHP文件中访问这些值？

Question

I've written a jQuery-AJAX function as follows :

$('#request_form').submit(function(e) {
  var form = $(this);
  var stud_id = $('#stud_id').val();
  var reg_date = $('#reg_date').val();
  var formdata = false;


  var fileInput = $("#receipt_image")[0];  

  /*I want to pass values of below variables to the PHP file.*/
  var ImgSizeInBytes = fileInput.files[0].size;
  var filename = $('input[type=file]').val().split('\\').pop();
  var customer_id = $('#customer_id').val();
 /*These values need to send to PHP file and access there */

  if(window.FormData) {
    formdata = new FormData(form[0]);
  }

  var formAction = form.attr('action');

  $.ajax({
    url         : 'student_request.php',
    type        : 'POST',    
    cache       : false,
    data        : formdata ? formdata : form.serialize(),
    contentType : false,
    processData : false,
    success: function(response) {
      var responseObject = $.parseJSON(response);    
      if(responseObject.error_message) { 
        if ($(".alert-dismissible")[0]) {
          $('.alert-dismissible').remove();   
        }  
        var htmlString = "<div class='alert alert-danger alert-dismissible' role='alert'><button type='button' class='close' data-dismiss='alert' aria-hidden='true'>&times;</button>"+responseObject.error_message+"</div>";    
        $(htmlString).insertBefore('div.modal-body #request_form');        
      } else { 
        alert("Student successfully registered...!!!");       
      }
    }
  });
  e.preventDefault();
});

Now I'm able to access the values filled in by user on a form by means of $_POST array in PHP file. But I also want to pass the values I put in comment in my code above to the PHP file.

The values/parameters which I want to send are not part of a form fields. I've manipulated the values of these variables. So they can't come in $_POST array.

My issue is how should I send these values to PHP file and how should I access these values in PHP file?

Answer 1

You should change this: formdata ? formdata : form.serialize()

Store this in a variable and concatenate the values you want to send.

For Example:

var pars = formdata ? formdata : form.serialize();
pars += "&myField1=myValue1&myField2=myValue2"