php 在后台线程/进程中调用函数（分叉）
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9014062/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Calling a function in a background thread / process (forking)
提问by xbonez
I have code that's somewhat like this:
我的代码有点像这样：
($i=0; $i < 100; $i++)
{
do ($foo[$i]);
}
The above is a time intensive task, and I was hoping to be able to create a function, and call it twice like below
以上是一项耗时的任务，我希望能够创建一个函数，并像下面这样调用它两次
function wrapper($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.
我查看了 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分叉。我试着阅读了很多关于它的信息，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()传入参数以便它在子进程中执行。此外，重要的是我能够注册回调函数。
Additional Details: PHP 5.3, running on Linux server. Script is executed by cgi-fcgi.
附加细节：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?
我认为这就是我应该如何生成子进程，但是如何使用它来生成多个子进程？以及如何注册回调函数？
$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?
采纳答案by Beel
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() && $t2->isAlive() ) {
}
回答by 0xen
If you are using Linux you can take advantage of the command line and do
如果您使用的是 Linux，则可以利用命令行并执行
public function newWrapperInstance($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，并将自身与主线程中的 exec 函数分离。
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的操作。
