求怎样解决fsockopen函数,错误
<?<br /> //获取文件大小<br /> function remote_filesize($url_file){<br /> if (!remote_file_exists($url_file)) return false;<br /> $headInf = get_headers($url_file,1);<br /> return $headInf['Content-Length'];<br /> }<br /> //判断文件是否存在<br /> function remote_file_exists($url_file){ <br /> $url_file = trim($url_file);<br /> if (empty($url_file)) return false;<br /> $url_arr = parse_url($url_file);<br /> if (!is_array($url_arr) || empty($url_arr)) return false;<br /> $host = $url_arr['host'];<br /> $path = $url_arr['path'] ."?".@$url_arr['query'];<br /> $port = isset($url_arr['port']) ?$url_arr['port'] : "80";<br /> $fp = fsockopen($host, $port, $err_no, $err_str,30);<br /> if (!$fp) return false;<br /> $request_str = "GET ".$path." HTTP/1.1\r\n";<br /> $request_str .= "Host:".$host."\r\n";<br /> $request_str .= "Connection:Close\r\n\r\n";<br /> fwrite($fp,$request_str);<br /> //fread replace fgets<br /> $first_header = fread($fp, 128);<br /> fclose($fp);<br /> if (trim($first_header) == "") return false;<br /> //check $url_file "Content-Location"<br /> if (!preg_match("/200/", $first_header) || preg_match("/Location:/", $first_header)) return false;<br /> return true;<br /> }<br /> echo remote_filesize("http://wlm212.bjphp1.qq1.cc/down/ee.exe");<br /> ?><br />
这个是我在网上找的,取远程文件大小的例子。
如果域名正常,文件存在就返回文件大小,
如果域名正常,文件不存在,就返回false。
现在问题出现了,如果域名不正常,就像上面这个地址,域名解析不了,也就是无法访问。这个时候会输出错误信息。
php_network_getaddresses: getaddrinfo failed: 不知道这样的主机。 in D:\PHPnow-1.5.6\htdocs\webadmin\inc\filesize.php on line 15
怎样能把这个错误信息去掉呢,在不修改web服务器配置的情况下,只在代码里面解决。
因为我要用ajax,取文件大小信息。所以不能报错,一报错,javascript获取的返回值,就是错误信息了,这个就导致前台无法运行了。
有会的吗,指点一下小弟。

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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