get_the_title()

get_the_title( int|WP_Post $post ): string

function get_the_title( $post = 0 ) {
	$post = get_post( $post );

	$post_title = $post->post_title ?? '';
	$post_id    = $post->ID ?? 0;

	if ( ! is_admin() ) {
		if ( ! empty( $post->post_password ) ) {

			/* translators: %s: Protected post title. */
			$prepend = __( 'Protected: %s' );

			/**
			 * Filters the text prepended to the post title for protected posts.
			 *
			 * The filter is only applied on the front end.
			 *
			 * @since 2.8.0
			 *
			 * @param string  $prepend Text displayed before the post title.
			 *                         Default 'Protected: %s'.
			 * @param WP_Post $post    Current post object.
			 */
			$protected_title_format = apply_filters( 'protected_title_format', $prepend, $post );

			$post_title = sprintf( $protected_title_format, $post_title );
		} elseif ( isset( $post->post_status ) && 'private' === $post->post_status ) {

			/* translators: %s: Private post title. */
			$prepend = __( 'Private: %s' );

			/**
			 * Filters the text prepended to the post title of private posts.
			 *
			 * The filter is only applied on the front end.
			 *
			 * @since 2.8.0
			 *
			 * @param string  $prepend Text displayed before the post title.
			 *                         Default 'Private: %s'.
			 * @param WP_Post $post    Current post object.
			 */
			$private_title_format = apply_filters( 'private_title_format', $prepend, $post );

			$post_title = sprintf( $private_title_format, $post_title );
		}
	}

	/**
	 * Filters the post title.
	 *
	 * @since 0.71
	 *
	 * @param string $post_title The post title.
	 * @param int    $post_id    The post ID.
	 */
	return apply_filters( 'the_title', $post_title, $post_id );
}