PHP-子进程没有'；t正确退出 - PHP - child processes doesn't exit properly

PHP - child processes doesn't exit properly

本文关键字：退出子进程 PHP- | 更新日期: 2023-09-27

我有以下PHP脚本。我需要用5个子进程（使用pcntl_fork（）函数）执行5个不同的任务。孩子们被正确地创造出来，他们做自己的事情，但他们似乎永远不会离开。父母等着他们结束，但从来没有发生过。有人能告诉我我做错了什么吗？

<?php
for ($i=1; $i<=5; $i++) {
    $pid = pcntl_fork();
    if ($pid == -1) {
        die("Error Creating subprocess ".$i);
        exit(-1);
    }
    else if (!$pid) {
        switch ($i) {
            case 1:
                // Child 1
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 2:
                // Child 2
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 3:
                // Child 3
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 4:
                // Child 4
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 5:
                // Child 5
               error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            default:
                break;
        }
    }
    else {
        $pids[] = $pid;
    }
}
error_log("Luke, I''m your father. PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
foreach ($pids as $key => $child) {
    $res = pcntl_waitpid($child, $status);
    //Check if this child has exited normally
    if (pcntl_wifexited($status))
        error_log("Child ".$child." has ended'n", 3, "/var/log/php_errors.log");
    else
        error_log("Child ".$child." is zombie'n", 3, "/var/log/php_errors.log");
    if($res == -1 || $res > 0)
        unset($pids[$key]);
}
?>

<?php
for ($i=1; $i<=5; $i++) {
    $pid = pcntl_fork();
    if ($pid == -1) {
        die("Error Creating subprocess ".$i);
        exit(-1);
    }
    else if (!$pid) {
        switch ($i) {
            case 1:
                // Child 1
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 2:
                // Child 2
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 3:
                // Child 3
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 4:
                // Child 4
                error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            case 5:
                // Child 5
               error_log("I''m the child number ".$i." PID: ".getmypid()."'n", 3, "/var/log/php_errors.log");
                //Doing some stuff
                exit;
            default:
                break;
        }
    }
    else {
        $pids[$pid] = $pid;
    }
}
while (!empty($pids)) {
  if ($child = pcntl_wait($status, WNOHANG)) {
    if (pcntl_wifexited($status))
        error_log("Child ".$child." has ended'n", 3, "/var/log/php_errors.log");
    else
        error_log("Child ".$child." is zombie'n", 3, "/var/log/php_errors.log");
    unset($pids[$child]);    
  } else
    usleep(100);
}

别忘了把$pids[]改成$pid；到$pid[$pid]=$pid；：o）或者选择更好的方式从数组退出的子项中弹出。