Zend Preparation | PHP Quiz (Learning Mode)

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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?

!header_exists("Location: $url")

!in_array("Location: $url", headers_list())

!header_location($url)

$_SERVER[''HTTP_LOCATION''] != $url