<?php

/**

 * User Registration API

 *

 * @package WordPress

 */

/**

 * Checks whether the given username exists.

 *

 * @since 2.0.0

 *

 * @param string $username Username.

 * @return null|int The user's ID on success, and null on failure.

 */

function username_exists( $username ) {

	if ( $user = get_userdatabylogin( $username ) ) {

		return $user->ID;

	} else {

		return null;

	}

}

/**

 * Checks whether the given email exists.

 *

 * @since 2.1.0

 * @uses $wpdb

 *

 * @param string $email Email.

 * @return bool|int The user's ID on success, and false on failure.

 */

function email_exists( $email ) {

	if ( $user = get_user_by_email($email) )

		return $user->ID;

	return false;

}

/**

 * Checks whether an username is valid.

 *

 * @since 2.0.1

 * @uses apply_filters() Calls 'validate_username' hook on $valid check and $username as parameters

 *

 * @param string $username Username.

 * @return bool Whether username given is valid

 */

function validate_username( $username ) {

	$sanitized = sanitize_user( $username, true );

	$valid = ( $sanitized == $username );

	return apply_filters( 'validate_username', $valid, $username );

}

/**

 * Insert an user into the database.

 *

 * Can update a current user or insert a new user based on whether the user's ID

 * is present.

 *

 * Can be used to update the user's info (see below), set the user's role, and

 * set the user's preference on whether they want the rich editor on.

 *

 * Most of the $userdata array fields have filters associated with the values.

 * The exceptions are 'rich_editing', 'role', 'jabber', 'aim', 'yim',

 * 'user_registered', and 'ID'. The filters have the prefix 'pre_user_' followed

 * by the field name. An example using 'description' would have the filter

 * called, 'pre_user_description' that can be hooked into.

 *

 * The $userdata array can contain the following fields:

 * 'ID' - An integer that will be used for updating an existing user.

 * 'user_pass' - A string that contains the plain text password for the user.

 * 'user_login' - A string that contains the user's username for logging in.

 * 'user_nicename' - A string that contains a nicer looking name for the user.

 *		The default is the user's username.

 * 'user_url' - A string containing the user's URL for the user's web site.

 * 'user_email' - A string containing the user's email address.

 * 'display_name' - A string that will be shown on the site. Defaults to user's

 *		username. It is likely that you will want to change this, for both

 *		appearance and security through obscurity (that is if you don't use and

 *		delete the default 'admin' user).

 * 'nickname' - The user's nickname, defaults to the user's username.

 * 'first_name' - The user's first name.

 * 'last_name' - The user's last name.

 * 'description' - A string containing content about the user.

 * 'rich_editing' - A string for whether to enable the rich editor or not. False

 *		if not empty.

 * 'user_registered' - The date the user registered. Format is 'Y-m-d H:i:s'.

 * 'role' - A string used to set the user's role.

 * 'jabber' - User's Jabber account.

 * 'aim' - User's AOL IM account.

 * 'yim' - User's Yahoo IM account.

 *

 * @since 2.0.0

 * @uses $wpdb WordPress database layer.

 * @uses apply_filters() Calls filters for most of the $userdata fields with the prefix 'pre_user'. See note above.

 * @uses do_action() Calls 'profile_update' hook when updating giving the user's ID

 * @uses do_action() Calls 'user_register' hook when creating a new user giving the user's ID

 *

 * @param array $userdata An array of user data.

 * @return int The newly created user's ID.

 */

function wp_insert_user($userdata) {

	global $wpdb;

	extract($userdata, EXTR_SKIP);

	// Are we updating or creating?

	if ( !empty($ID) ) {

		$ID = (int) $ID;

		$update = true;

		$old_user_data = get_userdata($ID);

	} else {

		$update = false;

		// Hash the password

		$user_pass = wp_hash_password($user_pass);

	}

	$user_login = sanitize_user($user_login, true);

	$user_login = apply_filters('pre_user_login', $user_login);

	if ( empty($user_nicename) )

		$user_nicename = sanitize_title( $user_login );

	$user_nicename = apply_filters('pre_user_nicename', $user_nicename);

	if ( empty($user_url) )

		$user_url = '';

	$user_url = apply_filters('pre_user_url', $user_url);

	if ( empty($user_email) )

		$user_email = '';

	$user_email = apply_filters('pre_user_email', $user_email);

	if ( empty($display_name) )

		$display_name = $user_login;

	$display_name = apply_filters('pre_user_display_name', $display_name);

	if ( empty($nickname) )

		$nickname = $user_login;

	$nickname = apply_filters('pre_user_nickname', $nickname);

	if ( empty($first_name) )

		$first_name = '';

	$first_name = apply_filters('pre_user_first_name', $first_name);

	if ( empty($last_name) )

		$last_name = '';

	$last_name = apply_filters('pre_user_last_name', $last_name);

	if ( empty($description) )

		$description = '';

	$description = apply_filters('pre_user_description', $description);

	if ( empty($rich_editing) )

		$rich_editing = 'true';

	if ( empty($comment_shortcuts) )

		$comment_shortcuts = 'false';

	if ( empty($admin_color) )

		$admin_color = 'fresh';

	$admin_color = preg_replace('|[^a-z0-9 _.\-@]|i', '', $admin_color);

	if ( empty($use_ssl) )

		$use_ssl = 0;

	if ( empty($jabber) )

		$jabber = '';

	if ( empty($aim) )

		$aim = '';

	if ( empty($yim) )

		$yim = '';

	if ( empty($user_registered) )

		$user_registered = gmdate('Y-m-d H:i:s');

	$user_nicename_check = $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND user_login != %s LIMIT 1" , $user_nicename, $user_login));

	if ($user_nicename_check) {

		$suffix = 2;

		while ($user_nicename_check) {

			$alt_user_nicename = $user_nicename . "-$suffix";

			$user_nicename_check = $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND user_login != %s LIMIT 1" , $alt_user_nicename, $user_login));

			$suffix++;

		}

		$user_nicename = $alt_user_nicename;

	}

	$data = compact( 'user_pass', 'user_email', 'user_url', 'user_nicename', 'display_name', 'user_registered' );

	$data = stripslashes_deep( $data );

	if ( $update ) {

		$wpdb->update( $wpdb->users, $data, compact( 'ID' ) );

		$user_id = (int) $ID;

	} else {

		$wpdb->insert( $wpdb->users, $data + compact( 'user_login' ) );

		$user_id = (int) $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 );

	update_usermeta( $user_id, 'rich_editing', $rich_editing);

	update_usermeta( $user_id, 'comment_shortcuts', $comment_shortcuts);

	update_usermeta( $user_id, 'admin_color', $admin_color);

	update_usermeta( $user_id, 'use_ssl', $use_ssl);

	if ( isset($role) ) {

		$user = new WP_User($user_id);

		$user->set_role($role);

	} elseif ( !$update ) {

		$user = new WP_User($user_id);

		$user->set_role(get_option('default_role'));

	}

	wp_cache_delete($user_id, 'users');

	wp_cache_delete($user_login, 'userlogins');

	if ( $update )

		do_action('profile_update', $user_id, $old_user_data);

	else

		do_action('user_register', $user_id);

	return $user_id;

}

/**

 * Update an user in the database.

 *

 * It is possible to update a user's password by specifying the 'user_pass'

 * value in the $userdata parameter array.

 *

 * If $userdata does not contain an 'ID' key, then a new user will be created

 * and the new user's ID will be returned.

 *

 * If current user's password is being updated, then the cookies will be

 * cleared.

 *

 * @since 2.0.0

 * @see wp_insert_user() For what fields can be set in $userdata

 * @uses wp_insert_user() Used to update existing user or add new one if user doesn't exist already

 *

 * @param array $userdata An array of user data.

 * @return int The updated user's ID.

 */

function wp_update_user($userdata) {

	$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'];

		$userdata['user_pass'] = wp_hash_password($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.

	$current_user = wp_get_current_user();

	if ( $current_user->id == $ID ) {

		if ( isset($plaintext_pass) ) {

			wp_clear_auth_cookie();

			wp_set_auth_cookie($ID);

		}

	}

	return $user_id;

}

/**

 * A simpler way of inserting an user into the database.

 *

 * Creates a new user with just the username, password, and email. For a more

 * detail creation of a user, use wp_insert_user() to specify more infomation.

 *

 * @since 2.0.0

 * @see wp_insert_user() More complete way to create a new user

 * @uses $wpdb Escapes $username and $email parameters

 *

 * @param string $username The user's username.

 * @param string $password The user's password.

 * @param string $email The user's email (optional).

 * @return int The new user's 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);

}

?>