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check login URL for specific query string
* Check the URL of the WordPress login
* page for a specific query string
* assumes login string is
function rkv_login_stringcheck() {
// set the location a failed attempt goes to
$redirect = '';
// missing query string all together
if (!isset ($_GET['question']) )
wp_redirect( esc_url_raw ($redirect), 302 );
// incorrect value for query string
if ($_GET['question'] !== 'answer' )
wp_redirect( esc_url_raw ($redirect), 302 );
add_action( 'login_init', 'rkv_login_stringcheck' );
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