PHP如何改写协程任务调度demo，使其适应长尾词？

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原文示例：php原文：本文字例讲述了PHP实现简单的协程任务调度的方法。分享给大众提供参考，具体如下：+phpclass+Task{+protected+$taskId;+protected+$coroutine;+protected+$sendValue=null;+protected+$beforeFirstYield=true;+public+function+fun+{

改写后：php本文字例介绍PHP实现简单协程任务调度的方法。供大家参考，具体如下：+phpclass+Task{+protected+$taskId;+protected+$coroutine;+protected+$sendValue=null;+protected+$beforeFirstYield=true;+public+function+fun+{

本文实例讲述了PHP实现简单的协程任务调度。分享给大家供大家参考，具体如下：

<?php class Task { protected $taskId; protected $coroutine; protected $sendValue = null; protected $beforeFirstYield = true; public function __construct($taskId, Generator $coroutine) { $this->taskId = $taskId; $this->coroutine = $coroutine; } public function getTaskId() { return $this->taskId; } public function setSendValue($sendValue) { $this->sendValue = $sendValue; } public function run() { if ($this->beforeFirstYield) { $this->beforeFirstYield = false; return $this->coroutine->current(); } else { $retval = $this->coroutine->send($this->sendValue); $this->sendValue = null; return $retval; } } public function isFinished() { return !$this->coroutine->valid(); } } class Scheduler { protected $maxTaskId = 0; protected $taskMap = []; // taskId => task protected $taskQueue; public function __construct() { $this->taskQueue = new SplQueue(); } public function newTask(Generator $coroutine) { $tid = ++$this->maxTaskId; $task = new Task($tid, $coroutine); $this->taskMap[$tid] = $task; $this->schedule($task); return $tid; } public function schedule(Task $task) { $this->taskQueue->enqueue($task); } public function run() { while (!$this->taskQueue->isEmpty()) { $task = $this->taskQueue->dequeue(); $task->run(); if ($task->isFinished()) { unset($this->taskMap[$task->getTaskId()]); } else { $this->schedule($task); } } } } function task1() { for ($i = 1; $i <= 10; ++$i) { echo "This is task 1 iteration $i.\n"; sleep(1); yield; } } function task2() { for ($i = 1; $i <= 10; ++$i) { echo "This is task 2 iteration $i.\n"; sleep(1); yield; } } $scheduler = new Scheduler; $scheduler->newTask(task1()); $scheduler->newTask(task2()); $scheduler->run();

运行结果：

This is task 1 iteration 1.
This is task 1 iteration 2.
This is task 1 iteration 3.
This is task 1 iteration 4.
This is task 1 iteration 5.
This is task 1 iteration 6.
This is task 1 iteration 7.
This is task 1 iteration 8.
This is task 1 iteration 9.
This is task 1 iteration 10.

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希望本文所述对大家PHP程序设计有所帮助。