viewing sent headers

Question: Consider the following function:

function redirect($url) {
// Check to make sure we haven't already sent
// the header:

if(???????) {
header("Location: $url");
}
}

?>
What conditional should replace the ????? above?

Answer:

1. !in_array("Location: $url", headers_list())
2. !header_exists("Location: $url")
3. !header_location($url)
4. $_SERVER['HTTP_LOCATION'] != $url
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