I'm currently trying to unset a session variable in WordPress if the page get's reloaded. I've tried a lot but it's not working like I want it. This is my function:
/**
* Unset filter session if page get's reloaded
*/
add_action( 'wp', 'unset_filter_session' );
function unset_filter_session() {
//Reset sessions on refresh page
unset( $_SESSION['expenditure_filter'] );
}
It's working but it's working too good. Because when I reload the content-area in WordPress via AJAX, the session get's unset too which should be avoided:
jQuery('#content-area').load(location.href + ' #content-area>*', '');
So how can I do the unset of the session just on page load and exclude AJAX reloads?
I'm currently trying to unset a session variable in WordPress if the page get's reloaded. I've tried a lot but it's not working like I want it. This is my function:
/**
* Unset filter session if page get's reloaded
*/
add_action( 'wp', 'unset_filter_session' );
function unset_filter_session() {
//Reset sessions on refresh page
unset( $_SESSION['expenditure_filter'] );
}
It's working but it's working too good. Because when I reload the content-area in WordPress via AJAX, the session get's unset too which should be avoided:
jQuery('#content-area').load(location.href + ' #content-area>*', '');
So how can I do the unset of the session just on page load and exclude AJAX reloads?
Share Improve this question asked Dec 5, 2018 at 0:05 Johnny97Johnny97 2147 silver badges18 bronze badges 4- I'd keep in mind that sessions don't work on all hosts, and are incompatible with a lot of caching mechanisms, with an added server overhead, which is why WP uses cookies and user meta – Tom J Nowell ♦ Commented Dec 5, 2018 at 0:43
- User meta is not possible for not registered users. Cookies might be a solution but what if the user disabled cookies? – Johnny97 Commented Dec 5, 2018 at 0:46
- I wouldn't expect any site to be able to track what I'm doing if I set cookies, which is kind of the point. At that point you could create table entries or posts and pass around a transaction ID, but then you would need the users consent to store data about them to comply with data protection legislation, else it could be illegal in some states/countries/continents, e.g. California, or the EU – Tom J Nowell ♦ Commented Dec 5, 2018 at 0:57
- Additionally, you can use URLs, a filtered view can have a filter endpoint on the end so it remains unique, this also improves compatibility with fullpage caching – Tom J Nowell ♦ Commented Dec 5, 2018 at 0:58
2 Answers
Reset to default 2Try using wp_doing_ajax() like so:
function unset_filter_session() {
if ( ! wp_doing_ajax() ) {
//Reset sessions on refresh page
unset( $_SESSION['expenditure_filter'] );
}
}
UPDATE
You can check the answer's revision for this update part..
UPDATE #2
Sorry, I didn't realize that you're loading a page fragment (#content-area) using the jQuery.load() method. Or that you're not using the admin-ajax.php to handle the AJAX request.
So if you're not using the wp_ajax_{action} or wp_ajax_nopriv_{action} action, or with the way you do the AJAX request, you can check whether the X-Requested-With header is set and that its value is XMLHttpRequest, and if so, you can cancel the session unsetting, like so:
function unset_filter_session() {
if ( empty( $_SERVER['HTTP_X_REQUESTED_WITH'] ) ||
'XMLHttpRequest' !== $_SERVER['HTTP_X_REQUESTED_WITH'] ) {
//Reset sessions on refresh page, if not doing AJAX request
unset( $_SESSION['expenditure_filter'] );
}
}
That should work because jQuery always sets that header, unless you explicitly remove it — or change its value.
See the headers option on the jQuery.ajax() reference:
The header
X-Requested-With: XMLHttpRequestis always added, but its defaultXMLHttpRequestvalue can be changed
Note: The header name is X-Requested-With, but in the superglobal $_SERVER, its key is HTTP_X_REQUESTED_WITH. I.e. Don't use $_SERVER['X-Requested-With'].
UPDATE #3
As suggested by Lawrence Johnson, you (ahem, we) should use filter_input():
function unset_filter_session() {
if ( 'XMLHttpRequest' !== filter_input( INPUT_SERVER, 'HTTP_X_REQUESTED_WITH' ) ) {
//Reset sessions on refresh page, if not doing AJAX request
unset( $_SESSION['expenditure_filter'] );
}
}
(but I kept the previous code for reference)
One thing you could consider doing is adding a header variable to your AJAX requests. Even a GET or POST param would likely to the trick. Perhaps something like this:
/**
* Unset filter session if page get's reloaded
*/
add_action( 'wp', 'unset_filter_session' );
function unset_filter_session() {
//Reset sessions on refresh page
if (!filter_input(INPUT_POST, 'isContentLoader', FILTER_SANITIZE_NUMBER_INT)) {
unset( $_SESSION['expenditure_filter'] );
}
}
And then
jQuery('#content-area').load(location.href + ' #content-area>*', { isContentLoader: 1 });