PHP安装threads多线程扩展基础教程

标题：PHP安装threads多线程扩展基础教程

1. 确认服务器环境

在安装threads多线程扩展前，需先确认一下服务器环境是否满足以下要求：

• PHP版本：5.5以上
• SAPI类型：CLI（Command Line Interface）
• 系统：Linux/Unix/MacOS

2. 安装pthreads多线程扩展

2.1 下载pthreads扩展

git clone https://github.com/krakjoe/pthreads.git

2.2 编译安装pthreads扩展

cd pthreads
phpize
./configure
make
make test
make install

2.3 启用pthreads扩展

在php.ini文件中加入以下配置：

extension=pthreads.so

3. 验证pthreads多线程扩展是否安装成功

创建一个php文件，命名为test.php，写入以下内容：

<?php

class MyThread extends Thread {
    public function run() {
        echo "Thread Id: " . $this->getThreadId() . PHP_EOL;
    }
}

for ($i = 0; $i < 10; $i++) {
    $myThread = new MyThread();
    $myThread->start();
}

?>

运行脚本：

php test.php

如果输出了10行Thread Id，则说明pthreads多线程扩展已经安装成功。

4. 示例说明

4.1 示例1：并发下载多个网页

<?php

class DownloadThread extends Thread {
    private $url;
    public $result;

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

    public function run() {
        $this->result = file_get_contents($this->url);
    }
}

$downloadThreads[] = new DownloadThread("https://www.baidu.com");
$downloadThreads[] = new DownloadThread("https://www.google.com");

foreach ($downloadThreads as &$downloadThread) {
    $downloadThread->start();
}

foreach ($downloadThreads as &$downloadThread) {
    $downloadThread->join();
    echo "Downloaded " . strlen($downloadThread->result) . " bytes." . PHP_EOL;
}
?>

4.2 示例2：多线程读取MySQL数据

<?php

class ReadThread extends Thread {
    private $mysqli;
    private $table;
    private $id;

    public function __construct($mysqli, $table, $id) {
        $this->mysqli = $mysqli;
        $this->table = $table;
        $this->id = $id;
    }

    public function run() {
        $sql = "SELECT * FROM " . $this->table . " WHERE id=" . $this->id;
        $result = $this->mysqli->query($sql);
        $this->setData($result->fetch_assoc());
        $this->mysqli->close();
    }

    public function setData($data) {
        $this->data = $data;
    }

    public function getData() {
        return $this->data;
    }
}

$mysqli = new mysqli("localhost","root","password","test");

$readThreads[] = new ReadThread($mysqli, "mytable", 1);
$readThreads[] = new ReadThread($mysqli, "mytable", 2);

foreach ($readThreads as &$readThread) {
    $readThread->start();
}

foreach ($readThreads as &$readThread) {
    $readThread->join();
    print_r($readThread->getData());
}

?>

这两个示例展示了如何利用pthreads扩展来进行多线程操作，更多的用法详见pthreads的官方文档。