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This article mainly explains "how to solve the PHP connection timeout". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to solve the PHP connection timeout.

Here is a common problem: script timeout in PHP environment, especially when dealing with background service data processing.

Maximum execution time of 120 seconds exceeded

Conventional solution and investigation method

Our troubleshooting idea generally starts from the amount of data, subjective judgment due to the program needs to deal with too much data, resulting in running processing time is too long, exceeding the maximum execution time of the script limited by the system. So is it really too much data to deal with, or is there a risk problem with the way the program is written or logic? We analyze it from the following aspects

1 the bottleneck appears at the database level, such as missing fields in relational or nosql database, that is, misspelling, resulting in database query jamming or huge amount of database data, and no index is established under the conditional field. In this case, the program will wait for the return of the database operation, and the script will naturally interrupt the error report.

Read timed out after reading 0 bytes, waited for 30.000000 seconds

2 reduce the amount of data processed at a single time and avoid cyclic operation of the database in foreach

The database layer can read data smoothly, the number of regular cycles is too many, and the application server and database server IO frequency is too high will still occur the above problems.

3 the process of the program involves reading, merging, combining large arrays, resulting in memory overload, such as PHP the maximum use of memory is 128m, while a script takes a few minutes, the use of memory up to 50m, with such a proportion, there must be risk in the long run.

The PHP built-in function memory_get_usage () returns the amount of memory currently allocated to the PHP script in byte.

The memory_get_peak_usage () function returns the peak memory usage, and getrusage () returns the CUP usage.

How to solve

The first solution: the simplest, but not lasting, unreasonable

Solve from the point of view of configuration

Set the program execution time-out in the script, set_time_limit (0)

Unlimited memory usage, ini_set ('memory_limit',0)

Increase the script timeout and cooperate to increase the number of memory usage M.

The second solution is the right remedy to the case.

Reasonable access to data, optimization of database structure, optimization of data access ratio and program logic, release of large arrays through unset.

Index optimization

As a practical example, adding a normal index to a MongoDb collection of 1 million data can reduce the time of a query from a few seconds to less than one second. You can foresee an improvement in the performance of such programs.

Can all the solutions discussed above solve the problem correctly? we find that the above solutions are limited to the synchronous programming model. At a deeper level, maybe we should switch from synchronous thinking to asynchronous thinking.

In php-fpm mode, blocking occurs when php processes a long task, so you can use an asynchronous method to throw the task and the program continues to execute downwards.

Asynchronous processing mode

So what are the common asynchronous processing methods in PHP application programming?

Use Redis or other message middleware to transfer, separate data from programs, and asynchronously handle long big data time-consuming tasks combined with message queuing

Or the introduction of Swool services framework, in the premise of large concurrency can feel the effect.

Make technology choices according to different business needs.

Thank you for your reading, the above is the content of "how to solve PHP connection timeout". After the study of this article, I believe you have a deeper understanding of how to solve this problem of PHP connection timeout, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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