if ( ! function_exists( 'string_limit_words' ) ) :
function string_limit_words($str, $limit = 18 , $need_end = false) {
    $words = explode(' ', $str, ($limit + 1));
    if(count($words) > $limit) {
        array_pop($words);
        array_push($words,'...');
    }
    return implode(' ', $words);
}
endif;