+ wp_cache_add($user->user_nicename, $user->ID, 'userslugs');
+}
+
+/**
+ * Clean all user caches
+ *
+ * @since 3.0.0
+ *
+ * @param WP_User|int $user User object or ID to be cleaned from the cache
+ */
+function clean_user_cache( $user ) {
+ if ( is_numeric( $user ) )
+ $user = new WP_User( $user );
+
+ if ( ! $user->exists() )
+ return;
+
+ wp_cache_delete( $user->ID, 'users' );
+ wp_cache_delete( $user->user_login, 'userlogins' );
+ wp_cache_delete( $user->user_email, 'useremail' );
+ wp_cache_delete( $user->user_nicename, 'userslugs' );
+}
+
+/**
+ * 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_user_by('login', $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 URL-friendly 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 appearance.
+ * '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. 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 mixed $userdata An array of user data or a user object of type stdClass or WP_User.
+ * @return int|WP_Error The newly created user's ID or a WP_Error object if the user could not be created.
+ */
+function wp_insert_user( $userdata ) {
+ global $wpdb;
+
+ if ( is_a( $userdata, 'stdClass' ) )
+ $userdata = get_object_vars( $userdata );
+ elseif ( is_a( $userdata, 'WP_User' ) )
+ $userdata = $userdata->to_array();
+
+ extract( $userdata, EXTR_SKIP );
+
+ // Are we updating or creating?
+ if ( !empty($ID) ) {
+ $ID = (int) $ID;
+ $update = true;
+ $old_user_data = WP_User::get_data_by( 'id', $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);
+
+ //Remove any non-printable chars from the login string to see if we have ended up with an empty username
+ $user_login = trim($user_login);
+
+ if ( empty($user_login) )
+ return new WP_Error('empty_user_login', __('Cannot create a user with an empty login name.') );
+
+ if ( !$update && username_exists( $user_login ) )
+ return new WP_Error( 'existing_user_login', __( 'Sorry, that username already exists!' ) );
+
+ if ( empty($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', $user_email);
+
+ if ( !$update && ! defined( 'WP_IMPORTING' ) && email_exists($user_email) )
+ return new WP_Error( 'existing_user_email', __( 'Sorry, that email address is already used!' ) );
+
+ if ( empty($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( $display_name ) ) {
+ if ( $update )
+ $display_name = $user_login;
+ elseif ( $first_name && $last_name )
+ /* translators: 1: first name, 2: last name */
+ $display_name = sprintf( _x( '%1$s %2$s', 'Display name based on first name and last name' ), $first_name, $last_name );
+ elseif ( $first_name )
+ $display_name = $first_name;
+ elseif ( $last_name )
+ $display_name = $last_name;
+ else
+ $display_name = $user_login;
+ }
+ $display_name = apply_filters( 'pre_user_display_name', $display_name );
+
+ if ( empty($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) )
+ $use_ssl = 0;
+
+ if ( empty($user_registered) )
+ $user_registered = gmdate('Y-m-d H:i:s');
+
+ if ( empty($show_admin_bar_front) )
+ $show_admin_bar_front = 'true';
+
+ $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;
+ }
+
+ $user = new WP_User( $user_id );
+
+ foreach ( _get_additional_user_keys( $user ) as $key ) {
+ if ( isset( $$key ) )
+ update_user_meta( $user_id, $key, $$key );
+ }
+
+ if ( isset($role) )
+ $user->set_role($role);
+ elseif ( !$update )
+ $user->set_role(get_option('default_role'));
+
+ wp_cache_delete($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;