jQuery and ajax to set session variable in PHP

Question

I'm using a session variable in PHP to manage the current language in a multi-language site. To achieve what I want I'm using a flag icon that when clicked (jQuery) it tells lang_json.php to switch the session variable to the new language.

I'm not getting errors on the jQuery side:

var sendData = 'en'; $.ajax({ type: "POST", contentType: "application/json; charset=utf-8", url: "lang_json.php", data: ({newLang: sendData}), dataType: "json", success: function (msg) { alert('Success'); }, error: function (err){ alert('Error'); } });

But the PHP file is not setting the session variable:

lang_json.php:

<?php // Session variables session_name('aklogin'); // Starting the session session_start(); if( isset($_POST['newLang']) ){ $_SESSION['current_lan'] = $_POST['newLang']; }else{ $_SESSION['current_lan'] = "Not Posting"; } ?>

The session variable is returning "Not Posting".

Can you try : data: ({"newLang": sendData}), With "newLang" in quotes? It looks like it's trying to use a variable there that doesn't exist. Is it not throwing an error in the JavaScript panel on that line of code? — Wesley Smith
– Wesley Smith, Commented Feb 7, 2015 at 22:33

Quentin · Accepted Answer · 2015-02-07 23:28:09Z

You claim you are sending the server JSON, but:

You aren't
The PHP isn't set up to receive JSON

Remove contentType: "application/json; charset=utf-8",, then jQuery will set the correct content-type and PHP will populate $_POST.

Architect · Accepted Answer · 2015-02-07 23:22:33Z

I kept playing with the jQuery side and this is what worked:

var sendData = 'en'; $.ajax({ type: 'POST', url: 'app/pro/pro_lang_session_json.php', data: {'newLang': sendData}, success: function (msg) { alert(sendData); }, error: function (err){ alert('Error'); } });

The session variable sets to 'en' with this code.

Thank you for your help! @DelightedDOD

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