* @global object $authordata The current author's DB object.

 * @return string|null The author's display name.

		_deprecated_argument( __FUNCTION__, '2.1.0' );

	 * Filters the display name of the current post's author.

 * return it. However, backward compatibility has to be maintained.

 * @return string|null The author's display name, from get_the_author().

	if ( ! empty( $deprecated ) ) {

		_deprecated_argument( __FUNCTION__, '2.1.0' );

	}

	if ( true !== $deprecated_echo ) {

		_deprecated_argument( __FUNCTION__, '1.5.0',

			/* translators: %s: get_the_author() */

			sprintf( __( 'Use %s instead if you do not want the value echoed.' ),

				'<code>get_the_author()</code>'

			)

		);

	}

	if ( $deprecated_echo ) {

	}

 * @return string|void The author's display name.

		 * Filters the display name of the author who last edited the current post.

 * Display the name of the author who last edited the current post,

 * if the author's ID is available.

 * Retrieves the requested data of the author of the current post.

 *

 * Valid values for the `$field` parameter include:

 *

 * - admin_color

 * - aim

 * - comment_shortcuts

 * - description

 * - display_name

 * - first_name

 * - ID

 * - jabber

 * - last_name

 * - nickname

 * - plugins_last_view

 * - plugins_per_page

 * - rich_editing

 * - syntax_highlighting

 * - user_activation_key

 * - user_description

 * - user_email

 * - user_firstname

 * - user_lastname

 * - user_level

 * - user_login

 * - user_nicename

 * - user_pass

 * - user_registered

 * - user_status

 * - user_url

 * - yim

 *

 *

 * @global object $authordata The current author's DB object.

 *

 * @param string $field   Optional. The user field to retrieve. Default empty.

 * @param int    $user_id Optional. User ID.

 * @return string The author's field from the current author's DB object, otherwise an empty string.

	$original_user_id = $user_id;

	 * Filters the value of the requested user metadata.

	 * @since 4.3.0 The `$original_user_id` parameter was added.

	 * @param string   $value            The value of the metadata.

	 * @param int      $user_id          The user ID for the value.

	 * @param int|bool $original_user_id The original user ID, as passed to the function.

	return apply_filters( "get_the_author_{$field}", $value, $user_id, $original_user_id );

 * Outputs the field from the user's DB object. Defaults to current post's author.

 *

 *

 * @param string $field   Selects the field of the users record. See get_the_author_meta()

 *                        for the list of possible fields.

 * @param int    $user_id Optional. User ID.

 *

 * @see get_the_author_meta()

	echo apply_filters( "the_author_{$field}", $author_meta, $user_id );

 *

 * @since 3.0.0

 *

 * @return string|null An HTML link if the author's url exist in user meta,

 *                     else the result of get_the_author().

		return sprintf( '<a href="%1$s" title="%2$s" rel="author external">%3$s</a>',

			esc_url( get_the_author_meta('url') ),

			/* translators: %s: author's display name */

			esc_attr( sprintf( __( 'Visit %s’s website' ), get_the_author() ) ),

			get_the_author()

		);

 * Retrieves an HTML link to the author page of the current post's author.

 *

 * Returns an HTML-formatted link using get_author_posts_url().

 * @since 4.4.0

 * @global object $authordata The current author's DB object.

 *

 * @return string An HTML link to the author page.

function get_the_author_posts_link() {

	if ( ! is_object( $authordata ) ) {

		return;

	}

	$link = sprintf( '<a href="%1$s" title="%2$s" rel="author">%3$s</a>',

		/* translators: %s: author's display name */

	 * Filters the link to the author page of the author of the current post.

	return apply_filters( 'the_author_posts_link', $link );

}

/**

 * Displays an HTML link to the author page of the current post's author.

 *

 * @since 1.2.0

 * @since 4.4.0 Converted into a wrapper for get_the_author_posts_link()

 *

 * @param string $deprecated Unused.

 */

function the_author_posts_link( $deprecated = '' ) {

	if ( ! empty( $deprecated ) ) {

		_deprecated_argument( __FUNCTION__, '2.1.0' );

	}

	echo get_the_author_posts_link();

 *

 * @global WP_Rewrite $wp_rewrite

 *

 * @param int    $author_id       Author ID.

 * @param string $author_nicename Optional. The author's nicename (slug). Default empty.

function get_author_posts_url( $author_id, $author_nicename = '' ) {

	 * Filters the URL to the author's page.

 * List all the authors of the site, with several options available.

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 *     @type string       $orderby       How to sort the authors. Accepts 'nicename', 'email', 'url', 'registered',

 *                                       'user_nicename', 'user_email', 'user_url', 'user_registered', 'name',

 *                                       'display_name', 'post_count', 'ID', 'meta_value', 'user_login'. Default 'name'.

 *     @type string       $order         Sorting direction for $orderby. Accepts 'ASC', 'DESC'. Default 'ASC'.

 *     @type int          $number        Maximum authors to return or display. Default empty (all authors).

 *     @type bool         $optioncount   Show the count in parenthesis next to the author's name. Default false.

 *     @type bool         $exclude_admin Whether to exclude the 'admin' account, if it exists. Default false.

 *     @type bool         $show_fullname Whether to show the author's full name. Default false.

 *     @type bool         $hide_empty    Whether to hide any authors with no posts. Default true.

 *     @type string       $feed          If not empty, show a link to the author's feed and use this text as the alt

 *                                       parameter of the link. Default empty.

 *     @type string       $feed_image    If not empty, show a link to the author's feed and use this image URL as

 *                                       clickable anchor. Default empty.

 *     @type string       $feed_type     The feed type to link to, such as 'rss2'. Defaults to default feed type.

 *     @type bool         $echo          Whether to output the result or instead return it. Default true.

 *     @type string       $style         If 'list', each author is wrapped in an `<li>` element, otherwise the authors

 *                                       will be separated by commas.

 *     @type bool         $html          Whether to list the items in HTML form or plaintext. Default true.

 *     @type array|string $exclude       Array or comma/space-separated list of author IDs to exclude. Default empty.

 *     @type array|string $include       Array or comma/space-separated list of author IDs to include. Default empty.

 * @return string|void The output, if echo is set to false.