<"host1.sample.com", "host2.sample.com", "host3.sample.com");
$timeout = 15;
$status = array();
foreach ($hosts as $host) {
 $errno = 0;
 $errstr = "";
 $s = fsockopen($host, 80, $errno, $errstr, $timeout);
 if ($s) {
 $status[$host] = "Connectedn";
 fwrite($s, "HEAD / HTTP/1.0rnHost: $hostrnrn");
 do {
  $data = fread($s, 8192);
  if (strlen($data) == 0) {
  break;
  }
  $status[$host] .= $data;
 } while (true);
 fclose($s);
 } else {
 $status[$host] = "Connection failed: $errno $errstrn";
 }
}
print_r($status);
"color: #3366ff">下面是PHP5中的解决方法：

代码如下



<"host1.sample.com", "host2.sample.com", "host3.sample.com");
$timeout = 15;
$status = array();
$sockets = array();
/* Initiate connections to all the hosts simultaneously */
foreach ($hosts as $id => $host) {
 $s = stream_socket_client("
$
$host:80", $errno, $errstr, $timeout,
 STREAM_CLIENT_ASYNC_CONNECT|STREAM_CLIENT_CONNECT);
 if ($s) {
 $sockets[$id] = $s;
 $status[$id] = "in progress";
 } else {
 $status[$id] = "failed, $errno $errstr";
 }
}
/* Now, wait for the results to come back in */
while (count($sockets)) {
 $read = $write = $sockets;
 /* This is the magic function - explained below */
 $n = stream_select($read, $write, $e = null, $timeout);
 if ($n > 0) {
 /* readable sockets either have data for us, or are failed
  * connection attempts */
 foreach ($read as $r) {
   $id = array_search($r, $sockets);
   $data = fread($r, 8192);
   if (strlen($data) == 0) {
  if ($status[$id] == "in progress") {
  $status[$id] = "failed to connect";
  }
  fclose($r);
  unset($sockets[$id]);
   } else {
  $status[$id] .= $data;
   }
 }
 /* writeable sockets can accept an HTTP request */
 foreach ($write as $w) {
  $id = array_search($w, $sockets);
  fwrite($w, "HEAD / HTTP/1.0rnHost: "
  . $hosts[$id] . "rnrn");
  $status[$id] = "waiting for response";
 }
 } else {
 /* timed out waiting; assume that all hosts associated
  * with $sockets are faulty */
 foreach ($sockets as $id => $s) {
  $status[$id] = "timed out " . $status[$id];
 }
 break;
 }
}
foreach ($hosts as $id => $host) {
 echo "Host: $hostn";
 echo "Status: " . $status[$id] . "nn";
} 
"color: #3366ff">下面是PHP4.1.0之后版本的实现，如果你已经在编译PHP时包含了sockets(ext/sockets)支持，你可以使用根上面类似的代码，只是需要将上面的streams/filesystem函数的功能用ext/sockets函数实现。主要的不同在于我们用下面的函数代替stream_socket_client()来建立连接：

代码如下 



<"color: #ff0000">PHP5的先进之处在于，你可以用stream_select()处理几乎所有的stream-例如你可以通过include STDIN用它接收键盘输入并保存进数组，你还可以接收通过proc_open()打开的管道中的数据。

下面来分享一个PHP多线程类

代码如下



* @title:   PHP多线程类(Thread)
 * @version:  1.0
 * 
 * PHP多线程应用示例：
 * require_once 'thread.class.php';
 * $thread = new thread();
 * $thread->addthread('action_log','a');
 * $thread->addthread('action_log','b');
 * $thread->addthread('action_log','c');
 * $thread->runthread();
 * 
 * function action_log($info) {
 *   $log = 'log/' . microtime() . '.log';
 *   $txt = $info . "rnrn" . 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn";
 *   $fp = fopen($log, 'w');
 *   fwrite($fp, $txt);
 *   fclose($fp);
 * }
 */
class thread {
 
  var $hooks = array();
  var $args = array();
 
  function thread() {
  }
 
  function addthread($func)
  {
    $args = array_slice(func_get_args(), 1);
    $this->hooks[] = $func;
    $this->args[] = $args;
    return true;
  }
 
  function runthread()
  {
    if(isset($_GET['flag']))
    {
      $flag = intval($_GET['flag']);
    }
    if($flag || $flag === 0)
    {
      call_user_func_array($this->hooks[$flag], $this->args[$flag]);
    }
    else
    {
      for($i = 0, $size = count($this->hooks); $i < $size; $i++)
      {
        $fp=fsockopen($_SERVER['HTTP_HOST'],$_SERVER['SERVER_PORT']);
        if($fp)
        {
          $out = "GET {$_SERVER['PHP_SELF']}";
          $out .= "Host: {$_SERVER['HTTP_HOST']}rn";
          $out .= "Connection: Closernrn";
          fputs($fp,$out);
          fclose($fp);
        }
      }
    }
  }
}



希望本文所述对大家的PHP程序设计有所帮助。

                                
                                

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