socket_bind

Binds a name to a socket (PHP 4 >= 4.0.7, PHP 5)
bool socket_bind ( resource socket, string address [, int port] )

Example 2291. Using socket_bind() to set the source address

<?php
// Create a new socket
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// An example list of IP addresses owned by the computer
$sourceips['kevin']    = '127.0.0.1';
$sourceips['madcoder'] = '127.0.0.2';

// Bind the source address
socket_bind($sock, $sourceips['madcoder']);

// Connect to destination address
socket_connect($sock, '127.0.0.1', 80);

// Write
$request = 'GET / HTTP/1.1' . "\r\n" .

           'Host: example.com' . "\r\n\r\n";
socket_write($sock, $request);

// Close
socket_close($sock);

?>

Code Examples / Notes » socket_bind

Use 0 for port to bind a random (free) port for incoming connections: socket_bind ($socket, $bind_address, 0); socket_getsockname($socket, $socket_address, $socket_port); socket_listen($socket); ... $socket_port contains the assigned port, you might want to send it to a remote client connecting. Tested with php 5.03.

The aforementioned tidbit about using NULL to bind to all addresses did not work for me, as I would receive an error about unknown address. Using a 0 worked for me: socket_bind ($socket, 0, $port) This also allows you to receive UDP broadcasts, which is what I had been trying to figure out.

If you want to reuse address and port, and get rid of error: unable to bind, address already in use, you have to use socket_setopt (check actual spelling for this function in you PHP verison) before calling bind: <?php if (!socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1)) { echo socket_strerror(socket_last_error($sock)); exit; } ?> This solution was found by Christophe Dirac. Thank you Christophe!

If you want to connect to server by specified port and you don't know your ip address or you have multiple interface for connecting to network, you can bind null instead of valid ip address like this : <?php $socket=socket_create(AF_INET,SOCK_STREAM,SOL_TCP); $local_port=1023; socket_bind($socket,null,$local_port); socket_connect($socket,$remote_host,$remote_port); ?>

socket_bind

Binds a name to a socket (PHP 4 >= 4.0.7, PHP 5) bool socket_bind ( resource socket, string address [, int port] )

Example 2291. Using socket_bind() to set the source address

Code Examples / Notes » socket_bind

Change Language

Binds a name to a socket (PHP 4 >= 4.0.7, PHP 5)
bool socket_bind ( resource socket, string address [, int port] )