并不令人惊讶，但可以。
function html_cut($text, $max_length){ $tags = array(); $result = ""; $is_open = false; $grab_open = false; $is_close = false; $in_double_quotes = false; $in_single_quotes = false; $tag = ""; $i = 0; $stripped = 0; $stripped_text = strip_tags($text); while ($i < strlen($text) && $stripped < strlen($stripped_text) && $stripped < $max_length) { $symbol = $text{$i}; $result .= $symbol; switch ($symbol) {case '<': $is_open = true; $grab_open = true; break;case '"': if ($in_double_quotes) $in_double_quotes = false; else $in_double_quotes = true; break; case "'": if ($in_single_quotes) $in_single_quotes = false; else $in_single_quotes = true; break; case '/': if ($is_open && !$in_double_quotes && !$in_single_quotes) { $is_close = true; $is_open = false; $grab_open = false; } break; case ' ': if ($is_open) $grab_open = false; else $stripped++; break; case '>': if ($is_open) { $is_open = false; $grab_open = false; array_push($tags, $tag); $tag = ""; } else if ($is_close) { $is_close = false; array_pop($tags); $tag = ""; } break; default: if ($grab_open || $is_close) $tag .= $symbol; if (!$is_open && !$is_close) $stripped++; } $i++; } while ($tags) $result .= "</".array_pop($tags).">"; return $result;}用法示例：
$content = html_cut($content, 100);
