Detailed explanation of steps to solve high concurrency issues using PHP file locks

This time I will bring you a detailed explanation of the steps for PHP to use file locks to solve high concurrency. What are the precautions for PHP to use file locks to solve high concurrency? The following is a practical case, let's take a look.

[1]. Blocking (waiting) mode: (As long as other processes have locked the file, the current process will wait for other processes to unlock the file )

0){mysqli_query($con,'UPDATE shop SET total=total-1 WHERE id=1');}
  //执行完成解锁
  flock($fp,LOCK_UN);
}
//关闭文件
fclose($fp);
unset($res);
mysqli_close($con);
?>

[2]. Non-blocking (waiting) mode:(As long as other processes have locked the file, the current process will not It will wait for other processes to unlock the file and return directly)

0){mysqli_query($con,'UPDATE shop SET total=total-1 WHERE id=1');}
  //执行完成解锁
  flock($fp,LOCK_UN);
}
//关闭文件
fclose($fp);
unset($res);
mysqli_close($con);
?>

demo2.php
Run two files at the same time, and then modify the locking mechanism in demo2, you can see the blocking (waiting) mode and The difference between non-blocking (waiting) mode. 
But this will cause the queue to be blocked. If 10 people write to the database at the same second, it will be blocked. The 10th person will wait for the first 9 to be executed before executing! 
 I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website! 
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