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<?php
/**
 * Author Template functions for use in themes.
 *
 * These functions must be used within the WordPress Loop.
 *
 * @link https://codex.wordpress.org/Author_Templates
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Retrieves the author of the current post.
 *
 * @since 1.5.0
 * @since 6.3.0 Returns an empty string if the author's display name is unknown.
 *
 * @global WP_User $authordata The current author's data.
 *
 * @param string $deprecated Deprecated.
 * @return string The author's display name, empty string if unknown.
 */
function get_the_author( $deprecated = '' ) {
	global $authordata;

if ( ! empty( $deprecated ) ) {
		_deprecated_argument( __FUNCTION__, '2.1.0' );
	}

/**
	 * Filters the display name of the current post's author.
	 *
	 * @since 2.9.0
	 *
	 * @param string $display_name The author's display name.
	 */
	return apply_filters( 'the_author', is_object( $authordata ) ? $authordata->display_name : '' );
}

/**
 * Displays the name of the author of the current post.
 *
 * The behavior of this function is based off of old functionality predating
 * get_the_author(). This function is not deprecated, but is designed to echo
 * the value from get_the_author() and as an result of any old theme that might
 * still use the old behavior will also pass the value from get_the_author().
 *
 * The normal, expected behavior of this function is to echo the author and not
 * return it. However, backward compatibility has to be maintained.
 *
 * @since 0.71
 *
 * @see get_the_author()
 * @link https://developer.wordpress.org/reference/functions/the_author/
 *
 * @param string $deprecated      Deprecated.
 * @param bool   $deprecated_echo Deprecated. Use get_the_author(). Echo the string or return it.
 * @return string The author's display name, from get_the_author().
 */
function the_author( $deprecated = '', $deprecated_echo = true ) {
	if ( ! empty( $deprecated ) ) {
		_deprecated_argument( __FUNCTION__, '2.1.0' );
	}

if ( true !== $deprecated_echo ) {
		_deprecated_argument(
			__FUNCTION__,
			'1.5.0',
			sprintf(
				/* translators: %s: get_the_author() */
				__( 'Use %s instead if you do not want the value echoed.' ),
				'<code>get_the_author()</code>'
			)
		);
	}

if ( $deprecated_echo ) {
		echo get_the_author();
	}

return get_the_author();
}

/**
 * Retrieves the author who last edited the current post.
 *
 * @since 2.8.0
 *
 * @return string|void The author's display name, empty string if unknown.
 */
function get_the_modified_author() {
	$last_id = get_post_meta( get_post()->ID, '_edit_last', true );

if ( $last_id ) {
		$last_user = get_userdata( $last_id );

/**
		 * Filters the display name of the author who last edited the current post.
		 *
		 * @since 2.8.0
		 *
		 * @param string $display_name The author's display name, empty string if unknown.
		 */
		return apply_filters( 'the_modified_author', $last_user ? $last_user->display_name : '' );
	}
}

/**
 * Displays the name of the author who last edited the current post,
 * if the author's ID is available.
 *
 * @since 2.8.0
 *
 * @see get_the_author()
 */
function the_modified_author() {
	echo get_the_modified_author();
}

/**
 * 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
 *
 * @since 2.8.0
 *
 * @global WP_User $authordata The current author's data.
 *
 * @param string    $field   Optional. The user field to retrieve. Default empty.
 * @param int|false $user_id Optional. User ID. Defaults to the current post author.
 * @return string The author's field from the current author's DB object, otherwise an empty string.
 */
function get_the_author_meta( $field = '', $user_id = false ) {
	$original_user_id = $user_id;

if ( ! $user_id ) {
		global $authordata;
		$user_id = isset( $authordata->ID ) ? $authordata->ID : 0;
	} else {
		$authordata = get_userdata( $user_id );
	}

if ( in_array( $field, array( 'login', 'pass', 'nicename', 'email', 'url', 'registered', 'activation_key', 'status' ), true ) ) {
		$field = 'user_' . $field;
	}

$value = isset( $authordata->$field ) ? $authordata->$field : '';

/**
	 * Filters the value of the requested user metadata.
	 *
	 * The filter name is dynamic and depends on the $field parameter of the function.
	 *
	 * @since 2.8.0
	 * @since 4.3.0 The `$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|false $original_user_id The original user ID, as passed to the function.
	 */
	return apply_filters( "get_the_author_{$field}", $value, $user_id, $original_user_id );
}

/**
 * Outputs the field from the user's DB object. Defaults to current post's author.
 *
 * @since 2.8.0
 *
 * @param string    $field   Selects the field of the users record. See get_the_author_meta()
 *                           for the list of possible fields.
 * @param int|false $user_id Optional. User ID. Defaults to the current post author.
 *
 * @see get_the_author_meta()
 */
function the_author_meta( $field = '', $user_id = false ) {
	$author_meta = get_the_author_meta( $field, $user_id );

/**
	 * Filters the value of the requested user metadata.
	 *
	 * The filter name is dynamic and depends on the $field parameter of the function.
	 *
	 * @since 2.8.0
	 *
	 * @param string    $author_meta The value of the metadata.
	 * @param int|false $user_id     The user ID.
	 */
	echo apply_filters( "the_author_{$field}", $author_meta, $user_id );
}

/**
 * Retrieves either author's link or author's name.
 *
 * If the author has a home page set, return an HTML link, otherwise just return
 * the author's name.
 *
 * @since 3.0.0
 *
 * @global WP_User $authordata The current author's data.
 *
 * @return string An HTML link if the author's URL exists in user meta,
 *                otherwise the result of get_the_author().
 */
function get_the_author_link() {
	if ( get_the_author_meta( 'url' ) ) {
		global $authordata;

$author_url          = get_the_author_meta( 'url' );
		$author_display_name = get_the_author();

$link = sprintf(
			'<a href="%1$s" title="%2$s" rel="author external">%3$s</a>',
			esc_url( $author_url ),
			/* translators: %s: Author's display name. */
			esc_attr( sprintf( __( 'Visit %s&#8217;s website' ), $author_display_name ) ),
			$author_display_name
		);

/**
		 * Filters the author URL link HTML.
		 *
		 * @since 6.0.0
		 *
		 * @param string  $link       The default rendered author HTML link.
		 * @param string  $author_url Author's URL.
		 * @param WP_User $authordata Author user data.
		 */
		return apply_filters( 'the_author_link', $link, $author_url, $authordata );
	} else {
		return get_the_author();
	}
}

/**
 * Displays either author's link or author's name.
 *
 * If the author has a home page set, echo an HTML link, otherwise just echo the
 * author's name.
 *
 * @link https://developer.wordpress.org/reference/functions/the_author_link/
 *
 * @since 2.1.0
 */
function the_author_link() {
	echo get_the_author_link();
}

/**
 * Retrieves the number of posts by the author of the current post.
 *
 * @since 1.5.0
 *
 * @return int The number of posts by the author.
 */
function get_the_author_posts() {
	$post = get_post();
	if ( ! $post ) {
		return 0;
	}
	return count_user_posts( $post->post_author, $post->post_type );
}

/**
 * Displays the number of posts by the author of the current post.
 *
 * @link https://developer.wordpress.org/reference/functions/the_author_posts/
 * @since 0.71
 */
function the_author_posts() {
	echo get_the_author_posts();
}

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