PHP 多进程实践（三）
5. windows多线程
windows系统不支持pcntl函数，幸好有curl_multi_exec()这个工具，利用内部的多线程，访问多个链接，每个链接可以作为一个任务。
编写脚本 test1.php
$task){ $ch[$i] = curl_init(); curl_setopt($ch[$i], CURLOPT_URL, $task); curl_setopt($ch[$i], CURLOPT_RETURNTRANSFER, 1); curl_multi_add_handle($mh, $ch[$i]);}do {$mrc = curl_multi_exec($mh,$active); } while ($mrc == CURLM_CALL_MULTI_PERFORM);while ($active && $mrc == CURLM_OK) { if (curl_multi_select($mh) != -1) { do {$mrc = curl_multi_exec($mh, $active); } while ($mrc == CURLM_CALL_MULTI_PERFORM); }}// completed, checkout resultforeach ($tasks as $j => $task){ if (curl_error($ch[$j])){ echo "task ${j} [$task ] error " , curl_error($ch[$j]), "\r\n" ; } else { echo "task ${j} [$task ] get: \r\n" , curl_multi_getcontent($ch[$j]), "\r\n" ; }}?>编写脚本 test2.php
用命令行运行
#php -f test1.php &
输出结果
task 0 [http://localhost/feedbowl/t2.php?job=task1] get:
child start, pid 5804
5804 2013-01-15 20:22:35
5804 2013-01-15 20:22:36
5804 2013-01-15 20:22:37
5804 2013-01-15 20:22:38
5804 2013-01-15 20:22:39
task 1 [http://localhost/feedbowl/t2.php?job=task2] get:
child start, pid 5804
5804 2013-01-15 20:22:35
5804 2013-01-15 20:22:36
5804 2013-01-15 20:22:37
5804 2013-01-15 20:22:38
5804 2013-01-15 20:22:39
task 2 [http://localhost/feedbowl/t2.php?job=task3] get:
child start, pid 5804
5804 2013-01-15 20:22:35
5804 2013-01-15 20:22:36
5804 2013-01-15 20:22:37
5804 2013-01-15 20:22:38
5804 2013-01-15 20:22:39
child start, pid 5804
5804 2013-01-15 20:22:35
5804 2013-01-15 20:22:36
5804 2013-01-15 20:22:37
5804 2013-01-15 20:22:38
5804 2013-01-15 20:22:39
task 1 [http://localhost/feedbowl/t2.php?job=task2] get:
child start, pid 5804
5804 2013-01-15 20:22:35
5804 2013-01-15 20:22:36
5804 2013-01-15 20:22:37
5804 2013-01-15 20:22:38
5804 2013-01-15 20:22:39
task 2 [http://localhost/feedbowl/t2.php?job=task3] get:
child start, pid 5804
5804 2013-01-15 20:22:35
5804 2013-01-15 20:22:36
5804 2013-01-15 20:22:37
5804 2013-01-15 20:22:38
5804 2013-01-15 20:22:39
从打印的时间看到，多个任务几乎是同时运行的。
