php怎么写socket服务器？利用PHP如何实现Socket服务器

// Set time limit to indefinite execution

set_time_limit (0);

// Set the ip and port we will listen on

$address='localhost'

$port= 10000;

$max_clients= 10;

// Array that will hold client information

$client= Array();

// Create a TCP Stream socket

$sock= socket_create(AF_INET, SOCK_STREAM, 0);

// Bind the socket to an address/port

socket_bind($sock,$address,$port)ordie('Could not bind to address');

// Start listening for connections

socket_listen($sock);

echo"Waiting for connections...rn";

// Loop continuously

while(true) {

// Setup clients listen socket for reading

$read[0] =$sock;

for($i= 0;$i<$max_clients;$i++) {

 if(isset($client[$i]['sock']))

  $read[$i+ 1] =$client[$i]['sock'];

}

// Set up a blocking call to socket_select()

if(socket_select($read,$write= NULL,$except= NULL,$tv_sec= 5) < 1)

 continue;

/* if a new connection is being made add it to the client array */

if(in_array($sock,$read)) {

 for($i= 0;$i<$max_clients;$i++) {

  if(empty($client[$i]['sock'])) {

  $client[$i]['sock'] = socket_accept($sock);

  echo"New client connected $irn";

  break;

  }

  elseif($i==$max_clients- 1)

  echo"Too many clients...rn";

 }

}// end if in_array

// If a client is trying to write - handle it now

for($i= 0;$i<$max_clients;$i++) {// for each client

 if(isset($client[$i]['sock'])) {

  if(in_array($client[$i]['sock'],$read)) {

  $input= socket_read($client[$i]['sock'], 1024);

  if($input== null) {

   echo"Client disconnecting $irn";

   // Zero length string meaning disconnected

   unset($client[$i]);

  }else{

   echo"New input received $irn";

   // send it to the other clients

   for($j= 0;$j<$max_clients;$j++) {

   if(isset($client[$j]['sock']) &&$j!=$i) {

    echo"Writing '$input' to client $jrn";

    socket_write($client[$j]['sock'],$input,strlen($input));

   }

   }

   if($input=='exit') {

   // requested disconnect

   socket_close($client[$i]['sock']);

   }

  }

  }else{

  echo"Client disconnected $irn";

  // Close the socket

  socket_close($client[$i]['sock']);

  unset($client[$i]);

  }

 }

}

}// end while

// Close the master sockets

socket_close($sock);