" . $s . ""; // 删除代码块里的
防止引起混乱 $s = preg_replace_callback('/(```.*?```|`[^`]*`)/s', function ($matches) { return str_replace('
', '', $matches[0]); }, $s); // 特殊转义 $s = str_replace("
", "\n", $s); return $s; } ?>