What is the best way within my PHP script to differentiate between a normal browser GUI request and an AJAX request?
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What is the best way within my PHP script to differentiate between a normal browser GUI request and an AJAX request?
Not as such.
You can write your JavaScript in such as way to to leave some sort of identifier in the request headers that you could use though. See the XHR
setRequestHeadermethod.A nice use of HTTP would be to modify the
Acceptheader and then do normal content negotiation. Then (for example), instead of caring if it is Ajax or not, you just care if an HTML response is preferred over a JSON response.Another convention is to use the non-standard
X-Requested-Withheader with a value ofXMLHttpRequest. A number of JavaScript libraries will add this by default to any request using XHR.Either of these techniques will only work with XMLHttpRequest or plugin based Ajax though. You can’t set arbitrary HTTP headers for JSON-P or iframe based Ajax.