php之daemon

<?php

//切换用户
$runUser = posix_getpwnam($runUserName);
if (!$runUser) {
    echo "$runUserName - No such user\n";
    exit(1);
}
if (!posix_setuid($runUser['uid'])) {
    echo "setuid($runUserName) failed\n";
    exit(1);
}

//daemon化
if (($pid1 = pcntl_fork()) != 0) {
    exit;
}
posix_setsid();
if (($pid2 = pcntl_fork()) != 0) {
    exit;
}