How can I determine a request as an ajax request?

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1. we can use X-Requested-With in the http header to determine

2. if jquery is used to complete the ajax request, $ _ SERVER will have a HTTP-X-REQUESTED-WITH key value, you can judge through this

For example:

If ($ _ SERVER ['http _ X_REQUESTED_WITH '] = 'xmlhttprequest') {$ username = isset ($ _ POST ['username'])? Addslashes ($ _ POST ['username']): ''; $ passwd = isset ($ _ POST ['passwd'])? Addslashes ($ _ POST ['passwd']): ''; if ($ username = 'lh '& $ passwd = 'passwd') {echo 'hello baidu! ';}} Else {echo' you must use ajax request! ';}

For ajax requests, what is the referer corresponding to the request header information?

For an ajax request, the referer parameter of the corresponding request header information is the url of the current page.

The preceding section describes how to determine whether a request is an ajax request ?, Including some content, hope to be helpful to friends who are interested in PHP tutorials.