Signup php

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$active_signup = get_site_option( 'registration', 'none' );
/**
* Filter the type of site sign-up.
*
* @since 3.0.0
*
* @param string $active_signup String that returns registration type. The value can be
* 'all', 'none', 'blog', or 'user'.
*/
$active_signup = apply_filters( 'wpmu_active_signup', $active_signup );
// Make the signup type translatable.
$i18n_signup['all'] = _x('all', 'Multisite active signup type');
$i18n_signup['none'] = _x('none', 'Multisite active signup type');
$i18n_signup['blog'] = _x('blog', 'Multisite active signup type');
$i18n_signup['user'] = _x('user', 'Multisite active signup type');
if ( is_super_admin() )
echo '' . sprintf( __( 'Greetings Site Administrator! You are currently
allowing “%s” registrations. To change or disable registration go to your Options page.' ), $i18n_signup[$active_signup],
esc_url( network_admin_url( 'settings.php' ) ) ) . '';
$newblogname = isset($_GET['new']) ? strtolower(preg_replace('/^-|-$|[^-a-zA-Z0-9]/', '',
$_GET['new'])) : null;
$current_user = wp_get_current_user();
if ( $active_signup == 'none' ) {
_e( 'Registration has been disabled.' );
} elseif ( $active_signup == 'blog' && !is_user_logged_in() ) {
$login_url = wp_login_url( network_site_url( 'wp-signup.php' ) );
echo sprintf( __( 'You must first log in, and then you can create a new
site.' ), $login_url );
} else {
$stage = isset( $_POST['stage'] ) ? $_POST['stage'] : 'default';
switch ( $stage ) {
case 'validate-user-signup' :
if ( $active_signup == 'all' || $_POST[ 'signup_for' ] == 'blog' &&
$active_signup == 'blog' || $_POST[ 'signup_for' ] == 'user' && $active_signup == 'user' )
validate_user_signup();
else
_e( 'User registration has been disabled.' );
break;
case 'validate-blog-signup':
if ( $active_signup == 'all' || $active_signup == 'blog' )
validate_blog_signup();
else
_e( 'Site registration has been disabled.' );
break;
case 'gimmeanotherblog':
validate_another_blog_signup();
break;
case 'default':
default :