How to handle task parallelism and polling processing in PHP development

Title: Task parallel processing and polling implementation in PHP development

In actual PHP development, parallel processing and polling of tasks are very common and important operations. This article will introduce how to handle parallel execution of tasks and polling processing in PHP, while providing specific code examples.

1. Task parallel processing

Task parallel processing means that multiple tasks are performed at the same time without blocking each other. In PHP, there are several common ways to implement parallel processing.

1. Multi-threaded parallel processing

Parallel processing of tasks can be achieved through multi-threading. PHP itself does not directly support multi-threading, but it can be implemented using extension libraries such as pthreads. The following is a sample code that uses the pthreads extension to create multiple threads for parallel processing tasks:

<?php
class MyThread extends Thread {
    private $task;

    public function __construct($task) {
        $this->task = $task;
    }

    public function run() {
        // 执行具体的任务操作
        // ...
    }
}

// 创建多个线程
$thread1 = new MyThread($task1);
$thread2 = new MyThread($task2);

// 启动线程
$thread1->start();
$thread2->start();

// 等待线程结束
$thread1->join();
$thread2->join();
?>

2. Multi-process parallel processing

In addition to multi-threading, we can also use multi-process To achieve parallel processing of tasks. PHP provides the pcntl extension to easily create and manage multiple processes. The following is a sample code that uses pcntl extension to create multiple processes to process tasks in parallel:

<?php
$tasks = array($task1, $task2);

foreach ($tasks as $task) {
    $pid = pcntl_fork();

    if ($pid == -1) {
        // 创建进程失败
        exit("Error forking process!");
    } elseif ($pid == 0) {
        // 子进程执行任务
        // 执行具体的任务操作
        // ...
        exit();
    }
}

// 等待所有子进程结束
while (pcntl_waitpid(0, $status) != -1) {
    $status = pcntl_wexitstatus($status);
    // 处理子进程执行结果
    // ...
}
?>

2. Task polling processing

Task polling processing refers to continuously processing tasks at certain intervals. Loop through and check if the task is completed. In PHP, we can use timers to implement polling processing of tasks.

The following is a sample code that uses a timer to implement task polling:

<?php
function checkTaskCompletion($task) {
    // 检查任务是否完成
    // ...

    return $completed;
}

$task = $task1;
$interval = 1; // 间隔时间，单位为秒

while (true) {
    $completed = checkTaskCompletion($task);

    if ($completed) {
        // 任务完成后执行相应的操作
        // ...
        break;
    }

    sleep($interval);
}
?>

In the above sample code, we define a checkTaskCompletion function to check whether the task is completed. Then, the function is continuously called in an infinite loop to check whether the task is completed, and if it is completed, perform the corresponding operation and break out of the loop.

Summary:

Task parallel processing and polling processing in PHP development are very important operations, which can improve the running efficiency and responsiveness of the program. Parallel execution of tasks is achieved through multi-threads or multi-processes, and multiple tasks can be performed at the same time without blocking each other; polling processing of tasks is implemented through timers, and the completion of tasks can be checked regularly. The above are specific code examples, which can be modified and expanded appropriately according to actual needs.

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