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function is not described

get_author_name() WP 1.0.0

Deprecated in 2.8.0. It is no longer supported and can be removed in future releases. Use get_the_author_meta() instead.

Retrieve the specified author's preferred display name.

  • See: get_the_author_meta()

No Hooks.

Return

String. The author's display name.

Usage

get_author_name( $auth_id );
$auth_id(int)
The ID of the author.
Default: false

Code of get author name: wp-includes/deprecated.php WP 5.2.2

<?php
function get_author_name( $auth_id = false ) {
	_deprecated_function( __FUNCTION__, '2.8.0', 'get_the_author_meta(\'display_name\')' );
	return get_the_author_meta('display_name', $auth_id);
}