Can I change default registration link (without htaccess)?

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I’m using url like «wp-login.php?action=register&role=patient» and «register_form» hook for add extra inputs form which depends on urls like this: 

add_action('register_form','add_extra_role_fields');

function add_extra_role_fields() {
if (isset($_GET['role'])) { $user_type = $_GET['role']; }

if (isset($user_type) && $user_type == "patient") [...] 
if (isset($user_type) && $user_type == "doctor") [...]

Problem: WordPress redirects user after form validation with error to http://example.com/wp-login.php?action=register instead of http://example.com/wp-login.php?action=register&role=patient
and all logic is broken.

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Question: Can wordpress redirect user to previos url «?action=register&role=doctor» (not default «?action=register») ?

Solution: Thank you Jan Fabry :). 

if ( isset($_REQUEST['role']) && ( ($_REQUEST['role'] == 'patient') OR ($_REQUEST['role'] == 'doctor') ) ) {

    add_filter( 'site_url', 'doctor_site_url', 10, 4 ); 

    function doctor_site_url( $url, $path, $scheme, $blog_id ) {
        if ( 'login_post' == $scheme ) {
            $url .= '&role='.$_REQUEST['role'];
            }
        return $url;
        }
}
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1 comment

  1. If you want to keep this information in the $_GET, you will have to modify the form’s action parameter URL. You can do this by hooking into site_url:

    add_filter( 'site_url', 'wpse18418_site_url', 10, 4 );
function wpse18418_site_url( $url, $path, $scheme, $blog_id )
{
    if ( 'login_post' == $scheme ) {
        $url .= '&role=doctor'; // Or do this dynamically
    }
    return $url;
}

    But instead of always looking in the $_GET, it might be a solution to save the role field in a hidden field and check $_REQUEST instead – it will contain both $_GET and $_POST.