php安全过滤函数示例代码

php 安全过滤函数代码，防止用户恶意输入内容。

代码如下:

//安全过滤输入[jb] function check_str($string, $isurl = false) { $string = preg_replace(&＃039;/[\\x00-\\x08\\x0B\\x0C\\x0E-\\x1F]/&＃039;,&＃039;&＃039;,$string); $string = str_replace(array("\0","%00","\r"),&＃039;&＃039;,$string); empty($isurl) && $string = preg_replace("/&(?!(#[0-9]+|[a-z]+);)/si",&＃039;&&＃039;,$string); $string = str_replace(array("%3C",&＃039;<&＃039;),&＃039;<&＃039;,$string); $string = str_replace(array("%3E",&＃039;>&＃039;),&＃039;>&＃039;,$string); $string = str_replace(array(&＃039;"&＃039;,"&＃039;","\t",&＃039; &＃039;),array(&＃039;“&＃039;,&＃039;‘&＃039;,&＃039; &＃039;,&＃039; &＃039;),$string); return trim($string); }

下面是为大家整理的一些过滤函数：

代码如下:

/*** 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", &＃039;&＃039;, $value);return $value;}/*** 安全过6来源gaodaimacom搞#^代%!码网搞gaodaima代码滤类-过滤HTML标签*  Controller中使用方法：$this->controller->fliter_html($value)* @param  string $value 需要过滤的值* @return string*/function fliter_html($value) {if (function_exists(&＃039;htmlspecialchars&＃039;)) return htmlspecialchars($value);return str_replace(array("&", &＃039;"&＃039;, "&＃039;", "<", ">"), array("&", "\"", "&＃039;", "<", ">"), $value);}/*** 安全过滤类-对进入的数据加下划线 防止SQL注入*  Controller中使用方法：$this->controller->fliter_sql($value)* @param  string $value 需要过滤的值* @return string*/function fliter_sql($value) {$sql = array("select", &＃039;insert&＃039;, "update", "delete", "\&＃039;", "\/\*",      "\.\.\/", "\.\/", "union", "into", "load_file", "outfile");$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) {$badstr = array("\0", "%00", "\r", &＃039;&&＃039;, &＃039; &＃039;, &＃039;"&＃039;, "&＃039;", "<", ">", "   ", "%3C", "%3E");$newstr = array(&＃039;&＃039;, &＃039;&＃039;, &＃039;&＃039;, &＃039;&&＃039;, &＃039; &＃039;, &＃039;"&＃039;, &＃039;&＃039;&＃039;, "<", ">", "   ", "<", ">");$value  = str_replace($badstr, $newstr, $value);$value  = preg_replace(&＃039;/&((#(\d{3,5}|x[a-fA-F0-9]{4}));)/&＃039;, &＃039;&\\1&＃039;, $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);$temp = array(&＃039;:/&＃039;,"\0", "..");if (str_replace($temp, &＃039;&＃039;, $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) {$path = str_replace(array("&＃039;",&＃039;#&＃039;,&＃039;=&＃039;,&＃039;`&＃039;,&＃039;$&＃039;,&＃039;%&＃039;,&＃039;&&＃039;,&＃039;;&＃039;), &＃039;&＃039;, $path);return rtrim(preg_replace(&＃039;/(\/){2,}|(\\\){1,}/&＃039;, &＃039;/&＃039;, $path), &＃039;/&＃039;);}/*** 过滤PHP标签*  Controller中使用方法：$this->controller->filter_phptag($string)* @param string $string* @return string*/public function filter_phptag($string) {return str_replace(array(&＃039;&＃039;), array(&＃039;&＃039;), $string);}/*** 安全过滤类-返回函数*  Controller中使用方法：$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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