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CI框架安全过滤函数示例

2024-05-04 22:42:42
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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* @param type $param = '常规字符串' 或 array('字符串1','字符串2');* @return string|array*/final protected function html_trim($param=''){  if(is_array($param) && !empty ($param)){    return ($param);  }  if(is_string($param)){    return htmlspecialchars(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 * @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 * @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 * @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 * @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 * @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 * @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 * @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 * @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 * @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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