How to solve the problem of php running for a long time and stopping for no reason

As a scripting language widely used in Web development, PHP (Hypertext Preprocessor) provides support for millions of web services almost every day. However, PHP developers sometimes encounter strange problems, one of the most vexing is when a long-running PHP program suddenly stops working. This problem is not common, but there are many possibilities, and it is difficult to identify the cause. This article will explain some of the reasons why PHP stops running for a long time without any reason and how to solve these problems.

1. PHP process is terminated

First of all, the execution time of the PHP script is controlled by the max_execution_time (in seconds) variable in server.ini or php.ini . When the PHP script takes more execution time than the time defined by this variable, it will stop for no reason. In other words, if your PHP program takes a long time to execute but does not complete, it is probably because the server terminated it. At this time, you need to increase the PHP execution time limit. You can do this in php.ini as follows Medium setting:

max_execution_time = 1800 ; 30 minutes

The execution time is set to 30 minutes, which is 1800 seconds. If you need to extend the PHP execution time limit, you can use the set_time_limit function:

set_time_limit(1800); // extend the time to 30 minutes

2. Maximum memory usage

In addition to the execution time limit, there is another common problem is the maximum Memory usage. When the memory used by your PHP script exceeds the server's memory limit, the script will also be terminated. At this time, you can consider setting memory_limit in the php.ini file:

memory_limit = 256M

The available memory limit is set to 256MB here, or you can use the set_memory_limit function to set it:

ini_set("memory_limit", "256M");

You can set it according to your own It is necessary to set appropriate values ​​to solve the problem of maximum memory usage. If you are running your PHP application on a shared server, consider asking your service provider to temporarily adjust the memory limit to resolve the issue.

3. A single request is too large

Even if your PHP program does not exceed the memory limit or execution time limit, if a single request needs to process a huge amount of data, it may Causes the PHP program to stop suddenly. At this time, it is necessary to reconsider the design of the PHP program, which can be solved by optimizing database queries, increasing indexes, or reducing the number of data rows.

4. Security Defense Mechanism

Finally, if your PHP application is under attack, the service provider may directly terminate the PHP process. This way, attackers cannot run malicious code on the server. If you believe your PHP application is under attack, please contact your service provider to resolve the issue.

Conclusion

The above are some reasons and solutions that may cause PHP to stop running for a long time without any reason. Of course, here are just a few of the most common situations. If you encounter other unusual situations, be sure to contact your service provider or a professional PHP development team for help. Finally, we would like to remind PHP developers to always pay attention to the operating status of PHP to ensure the normal operation and security of PHP applications.

The above is the detailed content of How to solve the problem of php running for a long time and stopping for no reason. For more information, please follow other related articles on the PHP Chinese website!