php 安全过滤函数

/**
* 安全过滤类-过滤javascript,css,iframes,object等不安全参数 过滤级别高
* Controller中使用方法：$this->controller->fliter_script($value)
* @param string $value 需要过滤的值
* @return string
*/
function fliter_script($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
* Controller中使用方法：$this->controller->fliter_html($value)
* @param string $value 需要过滤的值
* @return string
*/
function fliter_html($value){
if(function_exists('htmlspecialchars'))return htmlspecialchars($value);
return str_replace(array("&",'"',"'","<",">"), array("&","\"","'","<",">"), $value);
}

/**
* 安全过滤类-对进入的数据加下划线 防止SQL注入
* Controller中使用方法：$this->controller->fliter_sql($value)
* @param string $value 需要过滤的值
* @return string
*/
function fliter_sql($value){
$sql = array("select",'insert',"update","delete","\'","\/\*",
"\.\.\/","\.\/","union","into","load_file","outfile");
$sql_re = array("","","","","","","","","","","","");
return str_replace($sql, $sql_re, $value);
}

/**
* 安全过滤类-通用数据过滤
* Controller中使用方法：$this->controller->fliter_escape($value)
* @param string $value 需要过滤的变量
* @return string|array
*/
function fliter_escape($value){
if(is_array($value)){
foreach($value as $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
* Controller中使用方法：$this->controller->fliter_str($value)
* @param string $value 需要过滤的值
* @return string
*/
function fliter_str($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
* Controller中使用方法：$this->controller->filter_dir($fileName)
* @param string $fileName
* @return string
*/
function filter_dir($fileName){
$tmpname = strtolower($fileName);
$temp = array(':/',"\0","..");
if(str_replace($temp,'', $tmpname)!== $tmpname){
returnfalse;
}
return $fileName;
}

/**
* 过滤目录
* Controller中使用方法：$this->controller->filter_path($path)
* @param string $path
* @return array
*/
publicfunction filter_path($path){
$path = str_replace(array("'",'#','=','`','$','%','&',';'),'', $path);
return rtrim(preg_replace('/(\/){2,}|(\\\){1,}/','/', $path),'/');
}

/**
* 过滤PHP标签
* Controller中使用方法：$this->controller->filter_phptag($string)
* @param string $string
* @return string
*/
publicfunction filter_phptag($string){
return str_replace(array(''), array('<?','?>'), $string);
}

/**
* 安全过滤类-返回函数
* Controller中使用方法：$this->controller->str_out($value)
* @param string $value 需要过滤的值
* @return string
*/
publicfunction str_out($value){
$badstr = array("<",">","%3C","%3E");
$newstr = array("<",">","<",">");
$value = str_replace($newstr, $badstr, $value);
return stripslashes($value);//下划线
}