CI框架安全过滤函数示例
本文实例讲述了CI框架安全过滤函数。分享给大家供大家参考,具体如下:
1、CI框架版本:
/** *自动过滤变量,进行XSS,去空 *支持:单个字符串,多维数组,数字 *@paramtype$param='常规字符串'或array('字符串1','字符串2'); *@returnstring|array */ finalprotectedfunctionhtml_trim($param='') { if(is_array($param)&&!empty($param)){ return($param); } if(is_string($param)){ returnhtmlspecialchars(trim($param)); } if(is_numeric($param)) { return(int)$param; } return$param; }
使用方式为:
$this->html_trim($this->input->post('refer_url',TRUE));
由于第二个参数为TRUE,默认已经进行了xss过滤
2、原生PHP版本
/** *安全过滤类-过滤javascript,css,iframes,object等不安全参数过滤级别高 *@paramstring$value需要过滤的值 *@returnstring */ functionfliter_script($value){ $value=preg_replace("/(javascript:)?on(click|load|key|mouse|error|abort|move|unload|change|dblclick|move|reset|resize|submit)/i","&111n\\2",$value); $value=preg_replace("/(.*?)<\/script>/si","",$value); $value=preg_replace("/(.*?)<\/iframe>/si","",$value); $value=preg_replace("//iesU",'',$value); return$value; } /** *安全过滤类-过滤HTML标签 *@paramstring$value需要过滤的值 *@returnstring */ functionfliter_html($value){ if(function_exists('htmlspecialchars'))returnhtmlspecialchars($value); returnstr_replace(array("&",'"',"'","<",">"),array("&","\"","'","<",">"),$value); } /** *安全过滤类-对进入的数据加下划线防止SQL注入 *@paramstring$value需要过滤的值 *@returnstring */ functionfliter_sql($value){ $sql=array("select",'insert',"update","delete","\'","\/\*", "\.\.\/","\.\/","union","into","load_file","outfile"); $sql_re=array("","","","","","","","","","","",""); returnstr_replace($sql,$sql_re,$value); } /** *安全过滤类-通用数据过滤 *@paramstring$value需要过滤的变量 *@returnstring|array */ functionfliter_escape($value){ if(is_array($value)){ foreach($valueas$k=>$v){ $value[$k]=self::fliter_str($v); } }else{ $value=self::fliter_str($value); } return$value; } /** *安全过滤类-字符串过滤过滤特殊有危害字符 *@paramstring$value需要过滤的值 *@returnstring */ functionfliter_str($value){ $badstr=array("\0","%00","\r",'&','','"',"'","<",">","","%3C","%3E"); $newstr=array('','','','&','','"',''',"<",">","","<",">"); $value=str_replace($badstr,$newstr,$value); $value=preg_replace('/&((#(\d{3,5}|x[a-fA-F0-9]{4}));)/','&\\1',$value); return$value; } /** *私有路劲安全转化 *@paramstring$fileName *@returnstring */ functionfilter_dir($fileName){ $tmpname=strtolower($fileName); $temp=array(':/',"\0",".."); if(str_replace($temp,'',$tmpname)!==$tmpname){ returnfalse; } return$fileName; } /** *过滤目录 *@paramstring$path *@returnarray */ publicfunctionfilter_path($path){ $path=str_replace(array("'",'#','=','`','$','%','&',';'),'',$path); returnrtrim(preg_replace('/(\/){2,}|(\\\){1,}/','/',$path),'/'); } /** *过滤PHP标签 *@paramstring$string *@returnstring */ publicfunctionfilter_phptag($string){ returnstr_replace(array(''),array('','?>'),$string); } /** *安全过滤类-返回函数 *@paramstring$value需要过滤的值 *@returnstring */ publicfunctionstr_out($value){ $badstr=array("<",">","%3C","%3E"); $newstr=array("<",">","<",">"); $value=str_replace($newstr,$badstr,$value); returnstripslashes($value);//下划线 }
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