set_time_limit不影响PHP-CLI [英] set_time_limit is not affecting PHP-CLI

问题描述

如何解决不影响PHP-CLI的set_time_limit?

How to solve set_time_limit not affecting PHP-CLI?

#!/usr/bin/php -q 
<?php
set_time_limit(2);
sleep(5); // actually, exec() call that takes > 2 seconds
echo "it didn't work again";

推荐答案

此处的解决方案是使用pcntl_fork().恐怕仅是POSIX. PHP将需要使用--enable-pcntl而不是--disable-posix进行编译.您的代码应如下所示:

The solution here is to use pcntl_fork(). I'm afraid it's POSIX only. PHP will need to be compiled with --enable-pcntl and not --disable-posix. Your code should look something like this:

<?php

function done($signo)
{
    // You can do any on-success clean-up here.
    die('Success!');
}

$pid = pcntl_fork();
if (-1 == $pid) {
    die('Failed! Unable to fork.');
} elseif ($pid > 0) {
    pcntl_signal(SIGALRM, 'done');
    sleep($timeout);
    posix_kill($pid, SIGKILL);
    // You can do any on-failure clean-up here.
    die('Failed! Process timed out and was killed.');
} else {
    // You can perform whatever time-limited operation you want here.
    exec($cmd);
    posix_kill(posix_getppid(), SIGALRM);
}

?>

基本上，这是创建一个运行else { ... }块的新进程.最后(成功)，我们将警报发送回运行elseif ($pid > 0) { ... }块的父进程.该块具有用于警报信号(done()回调)的已注册信号处理程序，该信号处理程序成功终止.在接收到该消息之前，父进程将进入休眠状态.超时sleep()完成后，它将向子进程发送一个SIGKILL.

Basically what this does is fork a new process which runs the else { ... } block. At the (successful) conclusion of that we send an alarm back to the parent process, which is running the elseif ($pid > 0) { ... } block. That block has a registered signal handler for the alarm signal (the done() callback) which terminates successfully. Until that is received, the parent process sleeps. When the timeout sleep() is complete, it sends a SIGKILL to the (presumably hung) child process.

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