php在linux后台执行

<?php
ignore_user_abort();//后台运行
ini_set('default_socket_timeout', -1);//socket不超时
set_time_limit(0);
$host = "127.0.0.1";
$redis = new Redis();;
if($redis->connect($host)){
$redis->select(0);
while(true){
$msg = $redis->brPop('queue',0);
$myfile = fopen("/log/message_queue.log", "a");
if(!$myfile){
$newFile = '/log/'.time().'.log';
$myfile = fopen($newFile,"a");
}
$txt = json_encode($msg)."\n";
fwrite($myfile, $txt);
}
}else{
echo 'unable to connect';
}