#!/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.com>
* @license http://www.zend.com/license/3_0.txt PHP License 3.0
* @version 1.0.0
*/

/** 確保這個(gè)函數(shù)只能運(yùn)行在SHELL中 */
if (substr(php_sapi_name(), 0, 3) !== 'cli') {
die("This Programe can only be run in CLI mode");
}

/** 關(guān)閉最大執(zhí)行時(shí)間限制, 在CLI模式下, 這個(gè)語句其實(shí)不必要 */
set_time_limit(0);

$pid = posix_getpid(); //取得主進(jìn)程ID
$user = posix_getlogin(); //取得用戶名

echo <<<EOD
USAGE: [command | 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) {
$pid = pcntl_fork(); //創(chuàng)建子進(jìn)程
if ($pid == 0) {//子進(jìn)程
$pid = posix_getpid();
echo "* Process {$pid} was created, and Executed:\n\n";
eval($input); //解析命令
exit;
} else {//主進(jìn)程
$pid = pcntl_wait($status, WUNTRACED); //取得子進(jìn)程結(jié)束狀態(tài)
if (pcntl_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手也就是說, 打消你在PHP Web開發(fā)中使用多進(jìn)程的念頭吧!