* @since 3.1.0
	 *
	 * @return bool
	 */
	function is_date() {
		return (bool) $this->is_date;
	}


	/**
	 * Is the query for a day archive?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_day() {
		return (bool) $this->is_day;
	}

	/**
	 * Is the query for a feed?
	 *
	 * @since 3.1.0
	 *
	 * @param string|array $feeds Optional feed types to check.
	 * @return bool
	 */
	function is_feed( $feeds = '' ) {
		if ( empty( $feeds ) || ! $this->is_feed )
			return (bool) $this->is_feed;
		$qv = $this->get( 'feed' );
		if ( 'feed' == $qv )
			$qv = get_default_feed();
		return in_array( $qv, (array) $feeds );
	}

	/**
	 * Is the query for a comments feed?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_comment_feed() {
		return (bool) $this->is_comment_feed;
	}

	/**
	 * Is the query for the front page of the site?
	 *
	 * This is for what is displayed at your site's main URL.
	 *
	 * Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_on_front'.
	 *
	 * If you set a static page for the front page of your site, this function will return
	 * true when viewing that page.
	 *
	 * Otherwise the same as @see WP_Query::is_home()
	 *
	 * @since 3.1.0
	 * @uses is_home()
	 * @uses get_option()
	 *
	 * @return bool True, if front of site.
	 */
	function is_front_page() {
		// most likely case
		if ( 'posts' == get_option( 'show_on_front') && $this->is_home() )
			return true;
		elseif ( 'page' == get_option( 'show_on_front') && get_option( 'page_on_front' ) && $this->is_page( get_option( 'page_on_front' ) ) )
			return true;
		else
			return false;
	}

	/**
	 * Is the query for the blog homepage?
	 *
	 * This is the page which shows the time based blog content of your site.
	 *
	 * Depends on the site's "Front page displays" Reading Settings 'show_on_front' and 'page_for_posts'.
	 *
	 * If you set a static page for the front page of your site, this function will return
	 * true only on the page you set as the "Posts page".
	 *
	 * @see WP_Query::is_front_page()
	 *
	 * @since 3.1.0
	 *
	 * @return bool True if blog view homepage.
	 */
	function is_home() {
		return (bool) $this->is_home;
	}

	/**
	 * Is the query for a month archive?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_month() {
		return (bool) $this->is_month;
	}

	/**
	 * Is the query for a single page?
	 *
	 * If the $page parameter is specified, this function will additionally
	 * check if the query is for one of the pages specified.
	 *
	 * @see WP_Query::is_single()
	 * @see WP_Query::is_singular()
	 *
	 * @since 3.1.0
	 *
	 * @param mixed $page Page ID, title, slug, or array of such.
	 * @return bool
	 */
	function is_page( $page = '' ) {
		if ( !$this->is_page )
			return false;

		if ( empty( $page ) )
			return true;

		$page_obj = $this->get_queried_object();

		$page = (array) $page;

		if ( in_array( $page_obj->ID, $page ) )
			return true;
		elseif ( in_array( $page_obj->post_title, $page ) )
			return true;
		else if ( in_array( $page_obj->post_name, $page ) )
			return true;

		return false;
	}

	/**
	 * Is the query for paged result and not for the first page?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_paged() {
		return (bool) $this->is_paged;
	}

	/**
	 * Is the query for a post or page preview?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_preview() {
		return (bool) $this->is_preview;
	}

	/**
	 * Is the query for the robots file?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_robots() {
		return (bool) $this->is_robots;
	}

	/**
	 * Is the query for a search?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_search() {
		return (bool) $this->is_search;
	}

	/**
	 * Is the query for a single post?
	 *
	 * Works for any post type, except attachments and pages
	 *
	 * If the $post parameter is specified, this function will additionally
	 * check if the query is for one of the Posts specified.
	 *
	 * @see WP_Query::is_page()
	 * @see WP_Query::is_singular()
	 *
	 * @since 3.1.0
	 *
	 * @param mixed $post Post ID, title, slug, or array of such.
	 * @return bool
	 */
	function is_single( $post = '' ) {
		if ( !$this->is_single )
			return false;

		if ( empty($post) )
			return true;

		$post_obj = $this->get_queried_object();

		$post = (array) $post;

		if ( in_array( $post_obj->ID, $post ) )
			return true;
		elseif ( in_array( $post_obj->post_title, $post ) )
			return true;
		elseif ( in_array( $post_obj->post_name, $post ) )
			return true;

		return false;
	}

	/**
	 * Is the query for a single post of any post type (post, attachment, page, ... )?
	 *
	 * If the $post_types parameter is specified, this function will additionally
	 * check if the query is for one of the Posts Types specified.
	 *
	 * @see WP_Query::is_page()
	 * @see WP_Query::is_single()
	 *
	 * @since 3.1.0
	 *
	 * @param mixed $post_types Optional. Post Type or array of Post Types
	 * @return bool
	 */
	function is_singular( $post_types = '' ) {
		if ( empty( $post_types ) || !$this->is_singular )
			return (bool) $this->is_singular;

		$post_obj = $this->get_queried_object();

		return in_array( $post_obj->post_type, (array) $post_types );
	}

	/**
	 * Is the query for a specific time?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_time() {
		return (bool) $this->is_time;
	}

	/**
	 * Is the query for a trackback endpoint call?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_trackback() {
		return (bool) $this->is_trackback;
	}

	/**
	 * Is the query for a specific year?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_year() {
		return (bool) $this->is_year;
	}

	/**
	 * Is the query a 404 (returns no results)?
	 *
	 * @since 3.1.0
	 *
	 * @return bool
	 */
	function is_404() {
		return (bool) $this->is_404;
	}

	/**
	 * Is the query the main query?
	 *
	 * @since 3.3.0
	 *
	 * @return bool
	 */
	function is_main_query() {
		global $wp_the_query;
		return $wp_the_query === $this;
	}
}

/**
 * Redirect old slugs to the correct permalink.
 *
 * Attempts to find the current slug from the past slugs.
 *
 * @since 2.1.0
 * @uses $wp_query
 * @uses $wpdb
 *
 * @return null If no link is found, null is returned.
 */
function wp_old_slug_redirect() {
	global $wp_query;
	if ( is_404() && '' != $wp_query->query_vars['name'] ) :
		global $wpdb;

		// Guess the current post_type based on the query vars.
		if ( get_query_var('post_type') )
			$post_type = get_query_var('post_type');
		elseif ( !empty($wp_query->query_vars['pagename']) )
			$post_type = 'page';
		else
			$post_type = 'post';

		if ( is_array( $post_type ) ) {
			if ( count( $post_type ) > 1 )
				return;
			$post_type = array_shift( $post_type );
		}

		// Do not attempt redirect for hierarchical post types
		if ( is_post_type_hierarchical( $post_type ) )
			return;

		$query = $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, $wp_query->query_vars['name']);

		// if year, monthnum, or day have been specified, make our query more precise
		// just in case there are multiple identical _wp_old_slug values
		if ( '' != $wp_query->query_vars['year'] )
			$query .= $wpdb->prepare(" AND YEAR(post_date) = %d", $wp_query->query_vars['year']);
		if ( '' != $wp_query->query_vars['monthnum'] )
			$query .= $wpdb->prepare(" AND MONTH(post_date) = %d", $wp_query->query_vars['monthnum']);
		if ( '' != $wp_query->query_vars['day'] )
			$query .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", $wp_query->query_vars['day']);

		$id = (int) $wpdb->get_var($query);

		if ( ! $id )
			return;

		$link = get_permalink($id);

		if ( !$link )
			return;

		wp_redirect( $link, 301 ); // Permanent redirect
		exit;
	endif;
}

/**
 * Set up global post data.
 *
 * @since 1.5.0
 *
 * @param object $post Post data.
 * @uses do_action_ref_array() Calls 'the_post'
 * @return bool True when finished.
 */
function setup_postdata($post) {
	global $id, $authordata, $currentday, $currentmonth, $page, $pages, $multipage, $more, $numpages;

	$id = (int) $post->ID;

	$authordata = get_userdata($post->post_author);

	$currentday = mysql2date('d.m.y', $post->post_date, false);
	$currentmonth = mysql2date('m', $post->post_date, false);
	$numpages = 1;
	$page = get_query_var('page');
	if ( !$page )
		$page = 1;
	if ( is_single() || is_page() || is_feed() )
		$more = 1;
	$content = $post->post_content;
	if ( strpos( $content, '<!--nextpage-->' ) ) {
		if ( $page > 1 )
			$more = 1;
		$multipage = 1;
		$content = str_replace("\n<!--nextpage-->\n", '<!--nextpage-->', $content);
		$content = str_replace("\n<!--nextpage-->", '<!--nextpage-->', $content);
		$content = str_replace("<!--nextpage-->\n", '<!--nextpage-->', $content);
		$pages = explode('<!--nextpage-->', $content);
		$numpages = count($pages);
	} else {
		$pages = array( $post->post_content );
		$multipage = 0;
	}

	do_action_ref_array('the_post', array(&$post));

	return true;
}
?>
'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 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 array $userdata An array of user data.
 * @return int|WP_Error The newly created user's ID or a WP_Error object if the user could not be created.
 */
function wp_insert_user($userdata) {
	global $wpdb;

	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', __('This username is already registered.') );

	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', __('This email address is already registered.') );

	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($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;
}

/**
 * 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_obj = get_userdata( $ID );

	$user = get_object_vars( $user_obj->data );

	// Add additional custom fields
	foreach ( _get_additional_user_keys( $user_obj ) as $key ) {
		$user[ $key ] = get_user_meta( $ID, $key, true );
	}

	// Escape data pulled from DB.
	$user = add_magic_quotes( $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']);
	}

	wp_cache_delete($user[ 'user_email' ], 'useremail');

	// 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 more
 * complex user creation use wp_insert_user() to specify more information.
 *
 * @since 2.0.0
 * @see wp_insert_user() More complete way to create a new user
 *
 * @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 = '') {
	$user_login = esc_sql( $username );
	$user_email = esc_sql( $email    );
	$user_pass = $password;

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


/**
 * Return a list of meta keys that wp_insert_user() is supposed to set.
 *
 * @access private
 * @since 3.3.0
 *
 * @param object $user WP_User instance
 * @return array
 */
function _get_additional_user_keys( $user ) {
	$keys = array( 'first_name', 'last_name', 'nickname', 'description', 'rich_editing', 'comment_shortcuts', 'admin_color', 'use_ssl', 'show_admin_bar_front' );
	return array_merge( $keys, array_keys( _wp_get_user_contactmethods( $user ) ) );
}

/**
 * Set up the default contact methods
 *
 * @access private
 * @since
 *
 * @param object $user User data object (optional)
 * @return array $user_contactmethods Array of contact methods and their labels.
 */
function _wp_get_user_contactmethods( $user = null ) {
	$user_contactmethods = array(
		'aim' => __('AIM'),
		'yim' => __('Yahoo IM'),
		'jabber' => __('Jabber / Google Talk')
	);
	return apply_filters( 'user_contactmethods', $user_contactmethods, $user );
}

?>
<br />
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