JQuery variable sent with AJAX to PHP gets 'null' on var_dump();

Question

As the title describes it, I cannot get the value from my JQuery variable into a PHP one.

My JQuery code is like this:

$(document).ready(function() {
  var mbscr = 0;

  function checkSize() {
    if ($("#orientation").css("width") == "200px") {
      var mbscr = 1
    } else { 
      var mbscr = 2 
    }

    $.ajax({
      type:"POST",
      url: './a/cmn.arr.php',
      data: { mbscr : mbscr },
      cache: false,
      success: function(data) {
        console.log(data);
      }
    });
    return false;
  };

  checkSize(mbscr);

  $(window).resize(checkSize);
});

The PHP one is:

if(isset($_POST['mbscr']) && !empty($_POST['mbscr'])) {
    $_get_mbscr = $_POST['mbscr'];
}

var_dump($_get_mbscr);

If I use alert() instead of console.log(), the JQuery parts does its job, it alerts me what it should. My problem is I always get a null value for var_dump(), even when I do var_dump($_POST['mbscr']).

Any help will be appreciated, thank you.

Mb problem in than line ' url: './a/cmn.arr.php',' check withoud dot. — Michail M.
– Michail M., Commented Mar 27, 2017 at 11:54
what happens when you put this url in your browser? ./a/cmn.arr.php — Oliver
– Oliver, Commented Mar 27, 2017 at 11:54
The path is not the problem, I've tried doing it in index.php, and I got the same thing. — Ciprian C
– Ciprian C, Commented Mar 27, 2017 at 11:57
What will happen if you send data manually? data: { mbscr: 2}, — diavolic
– diavolic, Commented Mar 27, 2017 at 12:17

Alex Slipknot · Accepted Answer · 2017-03-27 12:50:39Z

1

You code should work. But if I understood right - you trying to see post data just while entering page? If you do so - you'll see array(0) because when you open page - request is GET. You can see real post result via network debugger (dev tools etc.)

edited Mar 27, 2017 at 12:50

answered Mar 27, 2017 at 12:23

Alex Slipknot

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18 Comments

Accountant م Over a year ago

No. that is a legal syntax for defining object properties. it might be identifier, number , or string , see

Alex Slipknot Over a year ago

Absolutely it can be. But, if this variable contains value then value will be used as is

Ciprian C Over a year ago

I get the same thing. I noticed a weird thing. In the firebug console, when I check POST response, the var_dump appears ok: array(1) { ["mbscr"]=> string(1) "2" } But what I see on the actual page is array(0) { }. Does this mean it's a server or client error? I'm not really that experienced. Thanks.

Alex Slipknot Over a year ago

@Ciprian C Excuse me :) If I understood right - you trying to see post data just while entering page? If you do so - you'll see array(0) because when you open page - request is GET. You can see real post result via network debugger (dev tools etc.)

Accountant م Over a year ago

@CiprianC Can you please explain that line "the var_dump appears ok: array(1) { ["mbscr"]=> string(1) "2" } But what I see on the actual page is array(0) { }. " var_dump should outputs to the actual page

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