PHP CLI模式下的多进程应用分析

#!/bin/env php
<?php
/ A example denoted muti-process application in php
@filename fork.php
@touch date Wed 10 Jun 2009 10:25:51 PM CST
@author Laruence<laruence@baidu.>
@license http://.zend./license/3_0.txt PHP License 3.0
@version 1.0.0
/

/ 确保这个函数只能运行在SHELL中 /
if (substr(php_sapi_name(), 0, 3) !== 'cli') {
die("This Programe can only be run in CLI mode");
}

/ 关闭最大执行时间限制, 在CLI模式下, 这个语句其实不必要 /
set_time_limit(0);

$pid = posix_getpid(); //取得主进程ID
$user = posix_getlogin(); //取得用户名

echo <<<EOD
USAGE: [mand | expression]
input php code to execute by fork a new process
input quit to exit

Shell Executor version 1.0.0 by laruence
EOD;

while (true) {

$prompt = "\n{$user}$ ";
$input = readline($prompt);

readline_add_history($input);
if ($input == 'quit') {
break;
}
process_execute($input . ';');
}

exit(0);

function process_execute($input) {
$pid = ptl_fork(); //创建子进程
if ($pid == 0) {//子进程
$pid = posix_getpid();
echo " Process {$pid} was created, and Executed:\n\n";
eval($input); //解析命令
exit;
} else {//主进程
$pid = ptl_wait($status, WUNTRACED); //取得子进程结束状态
if (ptl_wifexited($status)) {
echo "\n\n Sub process: {$pid} exited with {$status}";
}
}
}

Process Control should not be enabled within a webserver environment and unexpected results may happen if any Process Control functions are used within a webserver environment. --摘自PHP手也就是说, 打消你在PHP Web开发中使用多进程的念头吧!