(PHP 4 >= 4.1.0, PHP 5)
socket_recvfrom — Receives data from a socket whether or not it is connection-oriented
$socket
   , string &$buf
   , int $len
   , int $flags
   , string &$name
   [, int &$port
  ] )
   The socket_recvfrom() function receives
   len bytes of data in buf from
   name on port port (if the
   socket is not of type AF_UNIX) using
   socket. socket_recvfrom() can be
   used to gather data from both connected and unconnected sockets.
   Additionally, one or more flags can be specified to modify the behaviour of
   the function.
  
   The name and port must be
   passed by reference. If the socket is not connection-oriented,
   name will be set to the internet protocol address of
   the remote host or the path to the UNIX socket. If the socket is
   connection-oriented, name is NULL. Additionally,
   the port will contain the port of the remote host in
   the case of an unconnected AF_INET or
   AF_INET6 socket. 
  
socket
       The socket must be a socket resource previously
       created by socket_create().
      
buf
       The data received will be fetched to the variable specified with
       buf.
      
len
       Up to len bytes will be fetched from remote host.
      
flags
       The value of flags can be any combination of 
       the following flags, joined with the binary OR (|)
       operator.
      
| 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 lenare received.
           However, if a signal is caught or the remote host disconnects, the
           function may return less data. | 
| MSG_DONTWAIT | With this flag set, the function returns even if it would normally have blocked. | 
name
       If the socket is of the type AF_UNIX type,
       name is the path to the file. Else, for
       unconnected sockets, name is the IP address of,
       the remote host, or NULL if the socket is connection-oriented.
      
port
       This argument only applies to AF_INET and
       AF_INET6 sockets, and specifies the remote port
       from which the data is received. If the socket is connection-oriented,
       port will be NULL.
      
   socket_recvfrom() 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(). This error code may be
   passed to socket_strerror() to get a textual explanation
   of the error.
  
Example #1 socket_recvfrom() example
<?php
error_reporting(E_ALL | E_STRICT);
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
socket_bind($socket, '127.0.0.1', 1223);
$from = '';
$port = 0;
socket_recvfrom($socket, $buf, 12, 0, $from, $port);
echo "Received $buf from remote address $from and remote port $port" . PHP_EOL;
?>
This example will initiate a UDP socket on port 1223 of 127.0.0.1 and print at most 12 characters received from a remote host.
| Version | Description | 
|---|---|
| 4.3.0 | socket_recvfrom() is now binary safe. |