在后台线程/进程中调用函数（分叉）

I have code that's somewhat like this:

我的代码有点像这样：

($i=0; $i < 100; $i++)
{
   do ($foo[$i]);
}

The above is a time intensive task, and I was hoping to be able to create a function, and call it twice like below

以上是一项耗时的任务，我希望能够创建一个函数，并在下面调用它两次

function wrapper($start;$end)
{
    ($i=$start; $i < $end; $i++)
    {
       do ($foo[$i]);
    }
}
//have both of these run in parallel
wrapper(0,50);
wrapper(51,100);

I looked at Gearman but I cannot use it as I cannot install the gearman server (since I'm on a shared server). It seems like the way to achieve this would be by forking. I tried reading up a lot about it, but documentation and support is scant. Any help / wireframe code would be appreciated.

我看着Gearman，但我无法使用它，因为我无法安装gearman服务器（因为我在共享服务器上）。似乎实现这一目标的方法是通过分叉。我尝试了很多关于它的内容，但文档和支持很少。任何帮助/线框代码将不胜感激。

To define my question, how could I call wrapper() passing in arguments such that it executes in a child process. Also, its important that I be able to register a callback function.

为了定义我的问题，我如何调用wrapper（）传递参数，使其在子进程中执行。此外，重要的是我能够注册一个回调函数。

Additional Details: PHP 5.3, running on Linux server. Script is executed by cgi-fcgi.

其他详细信息：PHP 5.3，在Linux服务器上运行。脚本由cgi-fcgi执行。

I think this is how I am supposed to spawn a child process, but how can I use it to spawn multiple child processes? And how do I register a callback function?

我认为这是我应该如何产生子进程，但是如何使用它来产生多个子进程？我如何注册回调函数？

$pid = pcntl_fork(); 

if ( $pid == -1 ) {        
    // Fork failed            
    exit(1); 
} else if ( $pid ) { 
    // The parent process
    //should I repeat this same code here to spawn another child process?

} else { 
    // the child process 
    //can I call wrapper from here and will it run in this child process?

2 个解决方案

#1

From "Tudor Barbu's professional blog"
(http://blog.motane.lu/2009/01/02/multithreading-in-php/)

来自“Tudor Barbu的专业博客”（http://blog.motane.lu/2009/01/02/multithreading-in-php/）

require_once( 'Thread.php' );

// test to see if threading is available
if( ! Thread::isAvailable() ) {
    die( 'Threads not supported' );
}

// function to be ran on separate threads
function paralel( $_limit, $_name ) {
    for ( $index = 0; $index < $_limit; $index++ ) {
        echo 'Now running thread ' . $_name . PHP_EOL;
        sleep( 1 );
    }
}

// create 2 thread objects
$t1 = new Thread( 'paralel' );
$t2 = new Thread( 'paralel' );

// start them
$t1->start( 10, 't1' );
$t2->start( 10, 't2' );

// keep the program running until the threads finish
while( $t1->isAlive() && $t2->isAlive() ) {

}

Download Thread.php

下载Thread.php

#2

If you are using Linux you can take advantage of the command line and do

如果您使用的是Linux，则可以利用命令行进行操作

public function newWrapperInstance($start,$end){
    exec('bash -c "exec nohup setsid php-cli yourFile.php '.$start.' '.$end.' > /dev/null 2>&1 &"');
}

This will create a new instance of PHP in the background and detach itself from the exec function in the primary thread.

这将在后台创建一个新的PHP实例，并从主线程中的exec函数中分离出来。

Warning: The only downside is you can't control what those threads do once they are created.

警告：唯一的缺点是您无法控制这些线程创建后所执行的操作。

#1