php man page for socket_recv

SOCKET_RECV(3)								 1							    SOCKET_RECV(3)

socket_recv - Receives data from a connected socket

SYNOPSIS
       int socket_recv (resource  $socket, string  &$buf, int  $len, int  $flags)

DESCRIPTION
	The  socket_recv(3)  function  receives  $len bytes of data in $buf from $socket. socket_recv(3) can be used to gather data from connected
       sockets. Additionally, one or more flags can be specified to modify the behaviour of the function.

       $buf is passed by reference, so it must be specified as a variable in the argument list. Data read from $socket by socket_recv(3)  will	be
       returned in $buf.

PARAMETERS
	      o $socket
		- The $socket must be a socket resource previously created by socket_create().

	      o $buf
		-  The data received will be fetched to the variable specified with $buf. If an error occurs, if the connection is reset, or if no
		data is available, $buf will be set to NULL.

	      o $len
		- Up to $len bytes will be fetched from remote host.

	      o $flags
		- The value of $flags can be any combination of the following flags, joined with the binary OR ( |) operator.

	      Possible values for $flags

	      +-------------+---------------------------------------------------+
	      |    Flag     |							|
	      | 	    |							|
	      | 	    |			 Description			|
	      | 	    |							|
	      +-------------+---------------------------------------------------+
	      | 	    |							|
	      |  MSG_OOB    |							|
	      | 	    |							|
	      | 	    |		  Process out-of-band data.		|
	      | 	    |							|
	      | 	    |							|
	      |  MSG_PEEK   |							|
	      | 	    |							|
	      | 	    |  Receive data from the beginning of  the	receive |
	      | 	    | queue without removing it from the queue. 	|
	      | 	    |							|
	      | 	    |							|
	      |MSG_WAITALL  |							|
	      | 	    |							|
	      | 	    |  Block until at least $len are received. However, |
	      | 	    | if a signal is caught or the remote host	discon- |
	      | 	    | nects, the function may return less data. 	|
	      | 	    |							|
	      | 	    |							|
	      |MSG_DONTWAIT |							|
	      | 	    |							|
	      | 	    |  With this flag set, the function returns even if |
	      | 	    | it would normally have blocked.			|
	      | 	    |							|
	      +-------------+---------------------------------------------------+
RETURN VALUES
       socket_recv(3) returns the number of bytes received, or FALSE if there was an error. The actual error code  can	be  retrieved  by  calling
       socket_last_error(3). This error code may be passed to socket_strerror(3) to get a textual explanation of the error.

EXAMPLES
       Example #1

	      socket_recv(3) example

	       This example is a simple rewrite of the first example from "Examples" to use socket_recv(3).

	      <?php
	      error_reporting(E_ALL);

	      echo "<h2>TCP/IP Connection</h2>
";

	      /* Get the port for the WWW service. */
	      $service_port = getservbyname('www', 'tcp');

	      /* Get the IP address for the target host. */
	      $address = gethostbyname('www.example.com');

	      /* Create a TCP/IP socket. */
	      $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
	      if ($socket === false) {
		  echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "
";
	      } else {
		  echo "OK.
";
	      }

	      echo "Attempting to connect to '$address' on port '$service_port'...";
	      $result = socket_connect($socket, $address, $service_port);
	      if ($result === false) {
		  echo "socket_connect() failed.
Reason: ($result) " . socket_strerror(socket_last_error($socket)) . "
";
	      } else {
		  echo "OK.
";
	      }

	      $in = "HEAD / HTTP/1.1
";
	      $in .= "Host: www.example.com
";
	      $in .= "Connection: Close

";
	      $out = '';

	      echo "Sending HTTP HEAD request...";
	      socket_write($socket, $in, strlen($in));
	      echo "OK.
";

	      echo "Reading response:

";
	      $buf = 'This is my buffer.';
	      if (false !== ($bytes = socket_recv($socket, $buf, 2048, MSG_WAITALL))) {
		  echo "Read $bytes bytes from socket_recv(). Closing socket...";
	      } else {
		  echo "socket_recv() failed; reason: " . socket_strerror(socket_last_error($socket)) . "
";
	      }
	      socket_close($socket);

	      echo $buf . "
";
	      echo "OK.

";
	      ?>

	       The above example will produce something like:

	      <h2>TCP/IP Connection</h2>
	      OK.
	      Attempting to connect to '208.77.188.166' on port '80'...OK.
	      Sending HTTP HEAD request...OK.
	      Reading response:

	      Read 123 bytes from socket_recv(). Closing socket...HTTP/1.1 200 OK
	      Date: Mon, 14 Sep 2009 08:56:36 GMT
	      Server: Apache/2.2.3 (Red Hat)
	      Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT
	      ETag: "b80f4-1b6-80bfd280"
	      Accept-Ranges: bytes
	      Content-Length: 438
	      Connection: close
	      Content-Type: text/html; charset=UTF-8

	      OK.

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