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PHP : Function Reference : Socket Functions : socket_bind

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

php50613160534 dot 3 dot korkman

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.


gasket

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.


keksov

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!


masuod_a

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);
?>


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socket_accept
socket_bind
socket_clear_error
socket_close
socket_connect
socket_create_listen
socket_create_pair
socket_create
socket_get_option
socket_getpeername
socket_getsockname
socket_last_error
socket_listen
socket_read
socket_recv
socket_recvfrom
socket_select
socket_send
socket_sendto
socket_set_block
socket_set_nonblock
socket_set_option
socket_shutdown
socket_strerror
socket_write
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