php get_headers 判断返回是否是200 碰到不存在的脚本执行超时
不存在的IP网址,会一直等待响应,直到函数超时,导致页面迟迟无法显示。
failed to open stream: HTTP request failed!
Fatal error: Maximum execution time of 30 seconds exceeded
设置了 ini_set('max_execution_time', 10);还一样
要不不用这个函数自己写socket了,用这个函数的curl_init,麻烦,各位有啥别好的方法没
------解决方案--------------------
------解决方案--------------------
------解决方案--------------------
resource fsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )
最后一个参数 $timeout设为5,即可设置最大连接时间5秒,过期函数返回,程序并不会退出
------解决方案--------------------
思路是楼上的,get_headers 只能说php这个函数不完善,咱只有用socket自己写了
由于不能给自己分,我用另外的账号登陆了,以下是完整代码,也给别人做做贡献了
- PHP code
function DoGet($url) { $url2 = parse_url($url); if(!isset($url2['path']))$url2['path']=''; $url2["path"] = ($url2["path"] == "" ? "/" : $url2["path"]); $url2["port"] = (isset($url2["port"])?$url2["port"]:80); $host_ip = @gethostbyname($url2["host"]); $fsock_timeout =2; //2 second if(!($fsock = fsockopen($host_ip, $url2["port"], $errno, $errstr, $fsock_timeout))) { // echo 'fsockopen fail'; return false; } $request = $url2["path"] .(isset($url2["query"]) ? "?".$url2["query"] : ""); $in = "GET " . $request . " HTTP/1.0\r\n"; $in .= "Accept: */*\r\n"; $in .= "User-Agent: Payb-Agent\r\n"; $in .= "Host: " . $url2["host"] . "\r\n"; $in .= "Connection: Close\r\n\r\n"; stream_set_timeout( $fsock , $fsock_timeout ) ; if(!@fwrite($fsock, $in, strlen($in))){ //echo 'fwrite fail'; fclose($fsock); return false; } $status = stream_get_meta_data( $fsock ) ; //发送数据超时 if($status['timed_out'] ) { // echo "Write time out" ; fclose( $fsock ); return false; } $out = null; while($buff = @fgets($fsock, 2048)) { $out .= $buff; //只读取头部信息 if(false!==strpos($out, "\r\n\r\n"))break; } $status = stream_get_meta_data( $fsock ) ; //读取数据超时 if( $status['timed_out'] ) { // echo "Read time out" ; fclose( $fsock ); return false; } fclose($fsock); $pos = strpos($out, "\r\n\r\n"); $head = substr($out, 0, $pos); //http head return $head; } $rs= DoGet("http://www.ba05afasdfsiddf08usfa.com"); if(!$rs)echo 'fail'; else echo $rs; <div class="clear"> </div>

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.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Dreamweaver CS6
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Mac version
God-level code editing software (SublimeText3)