


PHP include class file timeout problem handling,
Recently, I discovered that PHP always times out when running automatic loading class functions. Tracking the PHP slow query log, I found that the program actually times out when it gets stuck in including a certain class file.
The initial positioning is that the io response timed out and there was a problem with hard disk reading.
Use several commands to locate:
iostat -d -x -k 1 10 // Run 10 times to see that the wait parameter in iostat is very large, generally no more than 5ms. The closer the two parameters of await svctm are, the better the io performance will be.
Refer to other blogs,
await: The average processing time of each IO request (unit is microseconds and milliseconds). This can be understood as the IO response time. Generally, the system IO response time should be less than 5ms. If it is greater than 10ms, it will be larger.
This time includes queue time and service time. That is to say, under normal circumstances, await is greater than svctm. The smaller the difference between them, the shorter the queue time. On the contrary, the larger the difference, the longer the queue time, indicating that the system has failed. problem. svctm represents the average service time (in milliseconds) of each device I/O operation. If the value of svctm is very close to await, it means there is almost no I/O waiting and the disk performance is very good. If the value of await is much higher than the value of svctm, it means the I/O queue wait is too long, and the applications running on the system will Slow down.
sudo iotop -o, // Check the program that is deleting the hard disk and check the io occupation ratio of the process
sudo perf top // Check the process io usage ratio
sudo hdparm -t /dev/**** View disk read efficiency
Display: Timing buffered disk reads: 10 MB in 3.14 seconds = 3.18 MB/sec
View non-interrupted sleep
while true; do date; ps auxf | awk '{if($8=="D") print $0;}'; sleep 1; done
After tracing through the above command, the hard disk reading efficiency is very low. The further reason is unknown. It is speculated that the hard disk may have bad sectors.

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

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.


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