is_author() WP 1.0

Is the query for an existing author archive page?

If the $author parameter is specified, this function will additionally check if the query is for one of the authors specified.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

No Hooks.

Return

true/false.

Usage

is_author( $author );

$author(mixed)

User ID, nickname, nicename, or array of User IDs, nicknames, and nicenames
Default: ''

Code of is author: wp-includes/query.php ^{VER 5.0.3}

<?php
function is_author( $author = '' ) {
	global $wp_query;

	if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
		return false;
	}

	return $wp_query->is_author( $author );
}

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