PHP无法取消设置会话变量

Question

I cannot unset a session variable used on a search filter. When clicking domain.com/index.php?filter=clear nothing happens and the filter is not cleared.

I am using a mixture of php and JS to update the table using AJAX

PHP:

/**
 * Clears the current filter
 */
function clear()
{
    unset($_SESSION['filter']);

    // Clear current page
    unset($_SESSION['arctic_page']);
}

}

JS:

clear: function()
{
    // Show loading image
    new Element('img', { src: '/images/loading.gif' }).setStyle('float', 'right').injectTop(Issues.container.getElement('h2'));

    // Create AJAX request
    new Ajax('index.php',
    {
        method: 'get',
        data: 'ajax=true&filter=clear',
        update: 'issue_list',
        onComplete: Issues.initialise
    }).request();
}

Answer 1

It looks like prototype JS, correct? It's been a while for me, but I thought this was the correct syntax:

new Ajax.Request('index.php',
{
    method: 'get',
    data: 'ajax=true&filter=clear',
    update: 'issue_list',
    onComplete: Issues.initialise
});