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Cross-domain AJAX question


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So, I understand if I add the following, that other domains can use the script via AJAX:


header("Access-Control-Allow-Origin: *");
code that does something


My question is: does this line have to be at the top of the file? Does it matter where this line is located?


I was thinking of doing something that lets a user configure their software's "allowed" domains, so, something like this:


$urls = db::some_query_to_see_allowed_origins();

if ( !empty( $urls ) )
    header("Access-Control-Allow-Origin: $urls");

code that does something


Would something like this work?  I don't know at what point the "cross-domain" errors occur, so I don't know where the header line needs to be.


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