How to use PHP and UniApp to implement multi-threaded processing of data

How to use PHP and UniApp to implement multi-threaded processing of data

In my daily development work, I find that sometimes when a large amount of data or time-consuming operations need to be processed, the single-threaded processing method will lead to poor program performance. decline, so multi-threading is needed to improve the efficiency of data processing. This article will introduce how to use PHP and UniApp to implement multi-threaded processing of data, and provide corresponding code examples to help readers better understand and apply.

1. PHP multi-threading implementation

In PHP, although there is no native multi-threading support, we can use the extension libraries pcntl and posix to implement process-based multi-threading. The following is a sample code that uses PHP to implement multi-threading:

$workers = [];
$urls = [

'http://www.baidu.com',
'http://www.google.com',
'http://www.github.com',

];

foreach ($urls as $url) {

$pid = pcntl_fork();

if ($pid == -1) {
    die('could not fork');
} elseif ($pid) {
    // 父进程
    $workers[] = $pid;
} else {
    // 子进程
    $content = file_get_contents($url);
    file_put_contents(md5($url) . '.html', $content);
    exit;
}

}

foreach ($workers as $pid) {

pcntl_waitpid($pid, $status);

}

echo "All done!" . PHP_EOL;
?>

In the above code, we define a $urls array, which stores a list of URLs that need to be processed. Then use a foreach loop to assign each URL to a child process for processing. Each child process is responsible for writing the content corresponding to the URL into the corresponding file. Finally, use the pcntl_waitpid function to wait for all child processes to finish executing, and finally output "All done!".

The above sample code can be run in the command line to verify the effect of multi-threading by observing the generated files or other custom logic.

2. Multi-threading in UniApp

UniApp is a cross-platform application development framework based on Vue.js and WeChat applet development. It can develop iOS, Android and Web applications at the same time. In UniApp, we can use JavaScript's Web Worker to achieve multi-threaded processing. The following is a sample code that uses UniApp to implement multi-threading:

// main.js
import Vue from 'vue'
import App from './App'

Vue.config.productionTip = false

App.mpType = 'app'

const app = new Vue({
...App
});
app .$mount();

// App.vue

<script><br>export default {<br> methods: {</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>startWorker() { const worker = new Worker('worker.js'); worker.postMessage({ url: 'http://www.baidu.com' }); worker.onmessage = function(event) { console.log(event.data); }; }</pre><div class="contentsignin">Copy after login</div></div><p>}<br>};<br></script>

// worker.js
self.onmessage = function(event) {
const url = event.data.url;

fetch(url)

.then(response => response.text())
.then(content => {
  // 处理返回的数据
  self.postMessage(content);
});

};

In the above sample code, we defined a button. Clicking the button will open a new Web Worker. Web Worker sends messages to the main thread through self.postMessage, and the main thread receives the message through worker.onmessage and processes it accordingly.

It should be noted that due to the characteristics of Web Worker, it can only run in the browser and cannot be used in mobile applications. Therefore, the above sample code is suitable for UniApp web-side development.

Conclusion

Through the above example code, we can see that it is not complicated to use PHP and UniApp to implement multi-threaded processing of data. This multi-threaded processing method can significantly improve the processing efficiency of large amounts of data or time-consuming operations, thereby improving program performance and user experience. In the actual development process, you can choose a suitable multi-thread processing method according to specific needs to achieve better results. I hope this article can provide readers with some help and inspiration in data processing.

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