//输出安全的htmlfunction h($text, $tags = null){ $text = trim($text); //完全过滤注释 $text = preg_replace('/<!--?.*-->/','',$text); //完全过滤动态代码 $text = preg_replace('/<\?|\?'.'>/','',$text); //完全过滤js $text = preg_replace('/<script?.*\/script>/','',$text);
$text = str_replace('[','[',$text); $text = str_replace(']',']',$text); $text = str_replace('|','|',$text); //过滤换行符 $text = preg_replace('/\r?\n/','',$text); //br $text = preg_replace('/<br(\s\/)?'.'>/i','[br]',$text); $text = preg_replace('/(\[br\]\s*){10,}/i','[br]',$text); //过滤危险的属性，如：过滤on事件lang js while(preg_match('/(<[^><]+)( lang|on|action|background|codebase|dynsrc|lowsrc)[^><]+/i',$text,$mat)){ $text=str_replace($mat[0],$mat[1],$text); } while(preg_match('/(<[^><]+)(window\.|javascript:|js:|about:|file:|document\.|vbs:|cookie)([^><]*)/i',$text,$mat)){ $text=str_replace($mat[0],$mat[1].$mat[3],$text); } if(empty($tags)) { $tags = 'table|td|th|tr|i|b|u|strong|img|p|br|div|strong|em|ul|ol|li|dl|dd|dt|a'; } //允许的HTML标签 $text = preg_replace('/<('.$tags.')( [^><\[\]]*)>/i','[\1\2]',$text); //过滤多余html $text = preg_replace('/<\/?(html|head|meta|link|base|basefont|body|bgsound|title|style|script|form|iframe|frame|frameset|applet|id|ilayer|layer|name|script|style|xml)[^><]*>/i','',$text); //过滤合法的html标签 while(preg_match('/<([a-z]+)[^><\[\]]*>[^><]*<\/\1>/i',$text,$mat)){ $text=str_replace($mat[0],str_replace('>',']',str_replace('<','[',$mat[0])),$text); } //转换引号 while(preg_match('/(\[[^\[\]]*=\s*)(\"|\')([^\2=\[\]]+)\2([^\[\]]*\])/i',$text,$mat)){ $text=str_replace($mat[0],$mat[1].'|'.$mat[3].'|'.$mat[4],$text); } //过滤错误的单个引号 while(preg_match('/\[[^\[\]]*(\"|\')[^\[\]]*\]/i',$text,$mat)){ $text=str_replace($mat[0],str_replace($mat[1],'',$mat[0]),$text); } //转换其它所有不合法的 < > $text = str_replace('<','<',$text); $text = str_replace('>','>',$text); $text = str_replace('"','"',$text); //反转换 $text = str_replace('[','<',$text); $text = str_replace(']','>',$text); $text = str_replace('|','"',$text); //过滤多余空格 $text = str_replace(' ',' ',$text); return $text;}
时间： 2024-09-14 19:48:44