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change php session value by click?

#('.btn-auth btn-facebook large').click(function(){
// fire off the request to /redirect.php
request = $.ajax({
    url: "/redirect.php",
    type: "post",
    data: 'facebook'

// callback handler that will be called on success
request.done(function (response, textStatus, jqXHR){
    // log a message to the console
    console.log("Hooray, it worked!");

// callback handler that will be called on failure (jqXHR, textStatus, errorThrown){
    // log the error to the console
        "The following error occured: "+
        textStatus, errorThrown

$_SESSION['role'] = $_POST['data'];


'onclick' will not fire php code. It will trigger javascript though. You can use javascript to make AJAX calls to a php page that'd in turn be able to set your session values (and ajax would help you do so without a page refresh on the button click.