PHP: Does $_SERVER['HTTP_X_REQUESTED_WITH'] exist or not?
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by Hank
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Published on 2010-04-05T15:38:39Z
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2010/04/05
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All over the Internet, included even here at StackOverlow, people state that a good way to check if a request is AJAX or not is to do the following:
strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest' )
However, I don't see $_SERVER['HTTP_X_REQUESTED_WITH'] in the official PHP documentation
And when I try to do the following:
echo $_SERVER['HTTP_X_REQUESTED_WITH'];
Nothing is outputted.
Am I doing something wrong? Because I'd really like to be able to use $_SERVER['HTTP_X_REQUESTED_WITH'] if it's available.
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