Question

I have a little bit of a confusing situation 🙂

I have a JavaScript function which is called by a few different pages. This JavaScript page then calls some server-side PHP code. About 98% of the time, there is no problem.

But sometimes the JavaScript does not pass an id parameter that it is supposed to, and that generates errors.

My problem is that I can not track down the page which makes the call to the JS function which then generates the PHP call with the error.

Any idea how I could track this down?

Answer 1

When your PHP script does its work, send the HTTP_REFERRER to the error log. Add the date & time, and $_GET vars for more info. This info should already be in your web server access log, but if you need the $_POST vars too you’ll want to create a custom message into the error log.

// Simple:
error_log("AJAX call from {$_SERVER['HTTP_REFERRER']}", 0);

// Fancy:
error_log(strftime("Y-m-d H:M:S") . " AJAX call from {$_SERVER['HTTP_REFERRER']}; POST: var1={$_POST['var1']} var2={$_POST['var2']}", 0);