root/tags/2.0/wp-includes/registration-functions.php

<?php

function username_exists( $username ) {
    global $wpdb;
    $username = sanitize_user( $username );
    $user = get_userdatabylogin($username);
    if ( $user )
        return $user->ID;

    return null;
}

function wp_insert_user($userdata) {
    global $wpdb;

    extract($userdata);

    // Are we updating or creating?
    if ( !empty($ID) ) {
        $update = true;
    } else {
        $update = false;
        // Password is not hashed when creating new user.
        $user_pass = md5($user_pass);
    }
    
    if ( empty($user_nicename) )
        $user_nicename = sanitize_title( $user_login );

    if ( empty($display_name) )
        $display_name = $user_login;
        
    if ( empty($nickname) )
        $nickname = $user_login;
            
    if ( empty($user_registered) )
        $user_registered = gmdate('Y-m-d H:i:s');

    if ( $update ) {
        $query = "UPDATE $wpdb->users SET user_pass='$user_pass', user_email='$user_email', user_url='$user_url', user_nicename = '$user_nicename', display_name = '$display_name' WHERE ID = '$ID'";
        $query = apply_filters('update_user_query', $query);
        $wpdb->query( $query );
        $user_id = $ID;
    } else {
        $query = "INSERT INTO $wpdb->users 
        (user_login, user_pass, user_email, user_url, user_registered, user_nicename, display_name)
    VALUES 
        ('$user_login', '$user_pass', '$user_email', '$user_url', '$user_registered', '$user_nicename', '$display_name')";
        $query = apply_filters('create_user_query', $query);
        $wpdb->query( $query );
        $user_id = $wpdb->insert_id;
    }
    
    update_usermeta( $user_id, 'first_name', $first_name);
    update_usermeta( $user_id, 'last_name', $last_name);
    update_usermeta( $user_id, 'nickname', $nickname );
    update_usermeta( $user_id, 'description', $description );
    update_usermeta( $user_id, 'jabber', $jabber );
    update_usermeta( $user_id, 'aim', $aim );
    update_usermeta( $user_id, 'yim', $yim );

    if ($update && !empty($role)) {
        $user = new WP_User($user_id);
        $user->set_role($role);
    }

    if ( !$update ) {
        $user = new WP_User($user_id);
        $user->set_role(get_settings('default_role'));
    }

    wp_cache_delete($user_id, 'users');
    wp_cache_delete($user_login, 'userlogins');
    
    if ( $update )
        do_action('profile_update', $user_id);
    else
        do_action('user_register', $user_id);
        
    return $user_id;    
}

function wp_update_user($userdata) {
    global $wpdb, $current_user;

    $ID = (int) $userdata['ID'];
    
    // First, get all of the original fields
    $user = get_userdata($ID);    

    // Escape data pulled from DB.
    $user = add_magic_quotes(get_object_vars($user));

    // If password is changing, hash it now.
    if ( ! empty($userdata['user_pass']) ) {
        $plaintext_pass = $userdata['user_pass'];
        $userdata['user_pass'] = md5($userdata['user_pass']);
    }

    // Merge old and new fields with new fields overwriting old ones.
    $userdata = array_merge($user, $userdata);
    $user_id = wp_insert_user($userdata);

    // Update the cookies if the password changed.    
    if( $current_user->id == $ID ) {
        if ( isset($plaintext_pass) ) {
            wp_clearcookie();
            wp_setcookie($userdata['user_login'], $plaintext_pass);
        }
    }
    
    return $user_id;
}

function wp_create_user( $username, $password, $email = '') {
    global $wpdb;
    
    $user_login = $wpdb->escape( $username );
    $user_email = $wpdb->escape( $email );
    $user_pass = $password;

    $userdata = compact('user_login', 'user_email', 'user_pass');
    return wp_insert_user($userdata);
}


function create_user( $username, $password, $email ) {
    return wp_create_user( $username, $password, $email );    
}


?>