Multi-tasking asynchronous processing method developed in PHP in WeChat applet

With the popularity of WeChat mini programs, more and more developers are beginning to pay attention to its backend development technology. In the background development of small programs, PHP is a very common language, and multi-tasking asynchronous processing is also a common technology in PHP development. This article will introduce the multi-task asynchronous processing method developed in PHP in WeChat applet.

1. What is multi-tasking asynchronous processing?

Multi-task asynchronous processing refers to executing multiple tasks at the same time and executing them in an asynchronous manner. Compared with synchronous processing, asynchronous processing can improve efficiency because while waiting for the result of a certain task, other tasks can continue to execute without blocking the execution of the entire program. In PHP, multi-tasking asynchronous processing is usually implemented through the curl_multi_exec function.

2. Curl_multi_exec function

The curl_multi_exec function is a function used in PHP to execute multiple curl handles. It will execute these handles asynchronously without blocking the execution of the entire program. Using the curl_multi_exec function requires the following steps:

1. Create a curl handle

Use the curl_init function to create a curl handle and set related options, such as the requested URL, the requested method, the requested parameters, Timeout, etc.

2. Add the curl handle to the curl_multi handle

Use the curl_multi_add_handle function to add the curl handle to the curl_multi handle for subsequent execution.

3. Execute the curl_multi_exec function

Use the curl_multi_exec function to execute all curl handles in the curl_multi handle in an asynchronous manner.

4. Get the return result of curl

Use the curl_multi_info_read function to get the return result of curl and process the result. If a curl handle has returned a result, the handle needs to be removed from the curl_multi handle and related resources released.

5. Loop execution

Before all curl handles are executed, the curl_multi_exec function needs to be executed in a loop until all curl handles are executed.

3. Sample code for multi-tasking asynchronous processing

The following is a sample code for using PHP for multi-tasking asynchronous processing in WeChat applet:

function multi_task($urls){
    $mh = curl_multi_init();
    $handles = array();
    foreach($urls as $url){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        curl_multi_add_handle($mh, $ch);
        $handles[] = $ch;
    }
    $running = null;
    do{
        curl_multi_exec($mh, $running);
    } while($running > 0);
    foreach($handles as $ch){
        curl_multi_remove_handle($mh, $ch);
        curl_close($ch); 
    }
    curl_multi_close($mh);
}

In the above example , the multi_task function is used to execute multiple curl handles, where the $urls parameter contains the list of URLs that need to be executed. In the function, first use the curl_multi_init function to create a curl_multi handle, traverse the $urls list, use the curl_init function to create a curl handle, and add the handle to the curl_multi handle. After that, use the curl_multi_exec function to execute all curl handles in the curl_multi handle, and after all curl handles have been executed, use the curl_multi_remove_handle function to remove the curl handle from the curl_multi handle and release related resources.

4. Application scenarios of multi-task asynchronous processing

Multi-task asynchronous processing has been widely used in the background development of WeChat mini programs, such as the following aspects:

1. Data batch processing

When using WeChat applet for data analysis, you may need to obtain data from multiple data sources at the same time and perform batch processing. Using multi-tasking asynchronous processing can increase the speed of data processing and shorten program running time.

2. Concurrent request processing

In the WeChat applet, it may be necessary to send requests to multiple third-party interfaces at the same time and return the results to the applet. Using multi-tasking asynchronous processing can reduce request response time and improve the running efficiency of small programs.

3. Asynchronous image upload

When uploading images, if you use synchronous uploading, you may need to wait for the image upload to complete before proceeding to the next step. Using multi-task asynchronous processing, you can upload multiple images concurrently and obtain the upload progress and status, increasing the timeliness and stability of image uploads.

5. Summary

Multi-task asynchronous processing is a common technology in PHP development, and it is also widely used in WeChat applet development. This article introduces the multi-tasking asynchronous processing method developed in PHP in WeChat applet, and provides sample code and application scenarios. I hope it can be helpful to developers in need.

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