Code-Snippets-Functions/Execute a function on a child site/All in One SEO Pack/limit-meta-description.txt

add_filter( 'aioseo_description', 'aioseo_truncate_description' );

function aioseo_truncate_description( $description ) {
    if ( function_exists( 'mb_substr') ) {
		return mb_substr( $description, 0, 160 );
	}
	return substr( $description, 0, 160 );
}