Prevent Direct Access To File Called By ajax Function [duplicate]

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Most Ajax requests/frameworks should set this particular header that you can use to filter Ajax v Non-ajax requests. I use this to help determine response type (json/html) in plenty of projects:

if( isset( $_SERVER['HTTP_X_REQUESTED_WITH'] ) && ( $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' ) )
{
    // allow access....
} else {
    // ignore....
}

edit:
You can add this yourself in your own Ajax requests with the following in your javascript code:

var xhrobj = new XMLHttpRequest();
xhrobj.setRequestHeader("X-Requested-With", "XMLHttpRequest");

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