php 多进程解决代码常驻内存的问题

2. #!/bin/env php
3. /** A example denoted muti-process application in php
4. * @filename fork.php
5. * @edit bbs.it-home.org
6. * @version 1.0.0
7. */
8. /** 确保这个函数只能运行在SHELL中 */
9. if
10. (substr(php_sapi_name(), 0, 3) !== 'cli')
11. {
12. die("This Programe can only be run in CLI mode");
13. }
14. /** 关闭最大执行事件限制, 在CLI模式下, 这个语句其实不必要 */
15. set_time_limit(0);
16. $pid = posix_getpid(); //取得主进程ID
17. $user = posix_getlogin(); //取得用户名
18. echo
19. USAGE: [command | expression]
20. input php code to execute by fork a new process
21. input quit to exit
22. Shell Executor version 1.0.0 by laruence
23. EOD;
24. while
25. (true)
26. {
27. $prompt = "\n{$user}$ ";
28. $input = readline($prompt);
29. readline_add_history($input);
30. if
31. ($input == 'quit')
32. {
33. break;
34. }
35. process_execute($input . ';');
36. }
37. exit(0);
38. function
39. process_execute($input)
40. {
41. $pid = pcntl_fork(); //创建子进程
42. if
43. ($pid == 0)
44. {//子进程
45. $pid = posix_getpid();
46. echo
47. "* Process {$pid} was created, and Executed:\n\n";
48. eval($input); //解析命令
49. exit;
50. }
51. else
52. {//主进程
53. $pid = pcntl_wait($status, WUNTRACED); //取得子进程结束状态
54. if
55. (pcntl_wifexited($status))
56. {
57. echo
58. "\n\n* Sub process: {$return['pid']} exited with {$status}";
59. }
60. }
61. }
62. ?>

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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。