function is_attachment( $attachment = '' ) {
	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_attachment( $attachment );
}

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Uses

Uses
Uses	Description
wp-includes/l10n.php: __()	Retrieve the translation of $text.
wp-includes/class-wp-query.php: WP_Query::is_attachment()	Is the query for an existing attachment page?
wp-includes/functions.php: _doing_it_wrong()	Mark something as being incorrectly called.

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Used By

Used By
Used By	Description
wp-includes/embed.php: wp_embed_excerpt_attachment()	Filters the post excerpt for the embed template.
wp-includes/link-template.php: get_adjacent_post_link()	Retrieves the adjacent post link.
wp-includes/link-template.php: get_adjacent_post_rel_link()	Retrieves the adjacent post relational link.
wp-includes/link-template.php: adjacent_posts_rel_link_wp_head()	Displays relational links for the posts adjacent to the current post for single post pages.
wp-includes/link-template.php: get_boundary_post()	Retrieves the boundary post.
wp-includes/post-template.php: wp_list_pages()	Retrieves or displays a list of pages (or hierarchical post type items) in list (li) format.
wp-includes/post-template.php: get_post_class()	Retrieves an array of the class names for the post container element.
wp-includes/post-template.php: get_body_class()	Retrieves an array of the class names for the body element.
wp-includes/canonical.php: redirect_canonical()	Redirects incoming links to the proper URL based on the site url.