PHP高级编程实例：编写守护进程

<?php
class ExampleWorker extends Worker {
 #public function __construct(Logging $logger) {
 # $this->logger = $logger;
 #}
 #protected $logger;
 protected static $dbh;
 public function __construct() {
 }
 public function run(){
  $dbhost = '192.168.2.1';  // 数据库服务器
  $dbport = 3306;
   $dbuser = 'www';  // 数据库用户名
 $dbpass = 'qwer123';    // 数据库暗码
  $dbname = 'example';  // 数据库名
  self::$dbh = new PDO("mysql:host=$dbhost;port=$dbport;dbname=$dbname",$dbuser,$dbpass,array(
   /* PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES 'UTF8'',*/
   PDO::MYSQL_ATTR_COMPRESS => true,PDO::ATTR_PERSISTENT => true
   )
  );
 }
 protected function getInstance(){
 return self::$dbh;
  }
}
/* the collectable class implements machinery for Pool::collect */
class Fee extends Stackable {
 public function __construct($msg) {
  $trades = explode(",",$msg);
  $this->data = $trades;
  print_r($trades);
 }
 public function run() {
  #$this->worker->logger->log("%s executing in Thread #%lu",__CLASS__,$this->worker->getThreadId() );
  try {
   $dbh = $this->worker->getInstance();
   
   $insert = "INSERT INTO fee(ticket,login,volume,`status`) VALUES(:ticket,:login,:volume,'N')";
   $sth = $dbh->prepare($insert);
   $sth->bindValue(':ticket',$this->data[0]);
   $sth->bindValue(':login',$this->data[1]);
   $sth->bindValue(':volume',$this->data[2]);
   $sth->execute();
   $sth = null;
   
   /* ...... */
   
   $update = "UPDATE fee SET `status` = 'Y' WHERE ticket = :ticket and `status` = 'N'";
   $sth = $dbh->prepare($update);
   $sth->bindValue(':ticket',$this->data[0]);
   $sth->execute();
   //echo $sth->queryString;
   //$dbh = null;
  }
  catch(PDOException $e) {
   $error = sprintf("%s,%sn",$mobile,$id );
   file_put_contents("mobile_error.log",$error,FILE_APPEND);
  }
 }
}
class Example {
 /* config */
 const LISTEN = "tcp://192.168.2.15:5555";
 const MAXCONN = 100;
 const pidfile = __CLASS__;
 const uid = 80;
 const gid = 80;
 
 protected $pool = NULL;
 protected $zmq = NULL;
 public function __construct() {
  $this->pidfile = '/var/run/'.self::pidfile.'.pid';
 }
 private function daemon(){
  if (file_exists($this->pidfile)) {
   echo "The file $this->pidfile exists.n";
   exit();
  }
  
  $pid = pcntl_fork();
  if ($pid == -1) {
    die('could not fork');
  } else if ($pid) {
    // we are the parent
    //pcntl_wait($status); //Protect against Zombie children
   exit($pid);
  } else {
   // we are the child
   file_put_contents($this->pidfile,getmypid());
   posix_setuid(self::uid);
   posix_setgid(self::gid);
   return(getmypid());
  }
 }
 private function start(){
  $pid = $this->daemon();
  $this->pool = new Pool(self::MAXCONN,ExampleWorker::class,[]);
  $this->zmq = new ZMQSocket(new ZMQContext(),ZMQ::SOCKET_REP);
  $this->zmq->bind(self::LISTEN);
  
  /* Loop receiving and echoing back */
  while ($message = $this->zmq->recv()) {
   //print_r($message);
   //if($trades){
     $this->pool->submit(new Fee($message));
     $this->zmq->send('TRUE'); 
   //}else{
   // $this->zmq->send('FALSE'); 
   //}
  }
  $pool->shutdown(); 
 }
 private function stop(){
  if (file_exists($this->pidfile)) {
   $pid = file_get_contents($this->pidfile);
   posix_kill($pid,9); 
   unlink($this->pidfile);
  }
 }
 private function help($proc){
  printf("%s start | stop | help n",$proc);
 }
 public function main($argv){
  if(count($argv) < 2){
   printf("please input help parametern");
   exit();
  }
  if($argv[1] === 'stop'){
   $this->stop();
  }else if($argv[1] === 'start'){
   $this->start();
  }else{
   $this->help($argv[0]);
  }
 }
}
$cgse = new Example();
$cgse->main($argv);

private function daemon(){
  if (file_exists($this->pidfile)) {
   echo "The file $this->pidfile exists.n";
   exit();
  }
  
  $pid = pcntl_fork();
  if ($pid == -1) {
    die('could not fork');
  } else if ($pid) {
   // we are the parent
   //pcntl_wait($status); //Protect against Zombie children
   exit($pid);
  } else {
   // we are the child
   file_put_contents($this->pidfile,getmypid());
   posix_setuid(self::uid);
   posix_setgid(self::gid);
   return(getmypid());
  }
 }

PHP利用
private function stop(){
  if (file_exists($this->pidfile)) {
   $pid = file_get_contents($this->pidfile);
   posix_kill($pid,9); 
   unlink($this->pidfile);
  }
 }