PHP整站防注入程序,需要在公共文件中require_once本文件,因为现在网站被注入攻击现象很严重,所以推荐大家使用,具体见如下代码。
<br /></p><p><?PHP </p>//PHP整站防注入程序,需要在公共文件中require_once本文件 <br />//判断magic_quotes_gpc状态 <br />if (@get_magic_quotes_gpc ()) { <br />$_GET = sec ( $_GET ); <br />$_POST = sec ( $_POST ); <br />$_COOKIE = sec ( $_COOKIE ); <br />$_FILES = sec ( $_FILES ); <br />} <br />$_SERVER = sec ( $_SERVER ); <br />function sec(&$array) { <br />//如果是数组,遍历数组,递归调用 <br />if (is_array ( $array )) { <br />foreach ( $array as $k => $v ) { <br />$array [$k] = sec ( $v ); <br />} <br />} else if (is_string ( $array )) { <br />//使用addslashes函数来处理 <br />$array = addslashes ( $array ); <br />} else if (is_numeric ( $array )) { <br />$array = intval ( $array ); <br />} <br />return $array; <br />} <br />//整型过滤函数 <br />function num_check($id) { <br />if (! $id) { <br />die ( '参数不能为空!' ); <br />} //是否为空的判断 <br />else if (inject_check ( $id )) { <br />die ( '非法参数' ); <br />} //注入判断 <br />else if (! is_numetic ( $id )) { <br />die ( '非法参数' ); <br />} <br />//数字判断 <br />$id = intval ( $id ); <br />//整型化 <br />return $id; <br />} <br />//字符过滤函数 <br />function str_check($str) { <br />if (inject_check ( $str )) { <br />die ( '非法参数' ); <br />} <br />//注入判断 <br />$str = htmlspecialchars ( $str ); <br />//转换html <br />return $str; <br />} <br />function search_check($str) { <br />$str = str_replace ( "_", "\_", $str ); <br />//把"_"过滤掉 <br />$str = str_replace ( "%", "\%", $str ); <br />//把"%"过滤掉 <br />$str = htmlspecialchars ( $str ); <br />//转换html <br />return $str; <br />} <br />//表单过滤函数 <br />function post_check($str, $min, $max) { <br />if (isset ( $min ) && strlen ( $str ) < $min) { <br />die ( '最少$min字节' ); <br />} else if (isset ( $max ) && strlen ( $str ) > $max) { <br />die ( '最多$max字节' ); <br />} <br />return stripslashes_array ( $str ); <br />} <br />//防注入函数 <br />function inject_check($sql_str) { <br />return eregi ( 'select|inert|update|delete|\'|\/\*|\*|\.\.\/|\.\/|UNION|into|load_file|outfile', $sql_str ); <br />// www.scutephp.com 进行过滤,防注入 <br />} <br />function stripslashes_array(&$array) { <br />if (is_array ( $array )) { <br />foreach ( $array as $k => $v ) { <br />$array [$k] = stripslashes_array ( $v ); <br />} <br />} else if (is_string ( $array )) { <br />$array = stripslashes ( $array ); <br />} <br />return $array; <br />} <br />?>

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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