php 多進程解決程式碼常駐記憶體的問題

#!/bin/env php
/** A example denoted muti-process application in php
* @filename fork.php
* @edit bbs.it-home.org
* @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");
}
/** 关闭最大执行事件限制, 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
<<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)
{
$pid = pcntl_fork(); //创建子进程
if
($pid == 0)
{//子进程
$pid = posix_getpid();
echo
"* Process {$pid} was created, and Executed:nn";
eval($input); //解析命令
exit;
}
else
{//主进程
$pid = pcntl_wait($status, WUNTRACED); //取得子进程结束状态
if
(pcntl_wifexited($status))
{
echo
"nn* Sub process: {$return['pid']} exited with {$status}";
}
}
}
?>

大家注意以上代码中的注释，可以帮助大家理解，也是代码的精粹所在哦。