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【PHP】 php 安全过滤函数
作者:dezai / 发布于2014/6/25/ 357

	/**
	* 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) {
	 return false;
	}
	return $fileName;
	}

	/**
	* 过滤目录
	* Controller中使用方法：$this->controller->filter_path($path)
	* @param string $path
	* @return array
	*/
	public function filter_path($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 $string
	* @return string
	*/
	public function filter_phptag($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 $value 需要过滤的值
	* @return string
	*/
	public function str_out($value) {
	$badstr = array("<", ">", "%3C", "%3E");
	$newstr = array("<", ">", "<", ">");
	$value = str_replace($newstr, $badstr, $value);
	return stripslashes($value); //下划线
	}
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　安全过滤　　安全　
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