/*---------------------- 过滤HTML代码的函数 -----------------------*/ function htmlEncode($string) {     $string=trim($string);     $string=str_replace("&","&",$string);     $string=str_replace("'","'",$string);     $string=str_replace("&amp;","&",$string);     $string=str_replace("&quot;",""",$string);     $string=str_replace("\"",""",$string);     $string=str_replace("&lt;","<",$string);     $string=str_replace("<","<",$string);     $string=str_replace("&gt;",">",$string);     $string=str_replace(">",">",$string);     $string=str_replace("&nbsp;"," ",$string);     $string=nl2br($string);     return $string; }