(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_bind — Passa um nome para o socket
$socket, string $address, int $port = ?): boolEsta função é EXPERIMENTAL. O comportamento desta função, seu nome e documentação poderão mudar sem aviso prévio em futuras versões do PHP. Use por sua conta e risco.
socket_bind() passa o nome dado em
address para o socket descrito por
socket, que deve ser um resource socket válido
criado com socket_create().
O parâmetro address é qualquer endereço IP
na notação "dotted-quad" (ex. 127.0.0.1), se o socket é da família AF_INET; ou o pathname de um
Unix-domain socket, se o socket é da família
AF_UNIX.
O parâmetro port é somente usado quando
estiver conectando com um socket AF_INET, e
determina a porta no host remoto para o qual a conexão deve ser feita.
Retorna true em caso de sucesso ou false em caso de falha. O código de erro pode ser retornado com
socket_last_error(). Esse código deve ser passado para
socket_strerror() para pegar uma explicação textual do
erro. Note que socket_last_error() é reportado para
retornar um código de erro inválido no caso de você estar tentando passar um socket
para um endereço errado que não pertence à sua máquina Windows 9x/ME.
Veja também socket_connect(), socket_listen(), socket_create(), socket_last_error() e socket_strerror().
If you want to reuse address and port, and get rid of error: unable to bind, address already in use, you have to use socket_setopt (check actual spelling for this function in you PHP verison) before calling bind:
<?php
if (!socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1)) {
echo socket_strerror(socket_last_error($sock));
exit;
}
?>
This solution was found by
Christophe Dirac. Thank you Christophe!
Regarding previous post:
"0" has address is no different from "0.0.0.0"
127.0.0.1 -> accept only from local host
w.x.y.z (valid local IP) -> accep only from this network
0.0.0.0 -> accept from anywhere
Use 0 for port to bind a random (free) port for incoming connections:
socket_bind ($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.
I am posting this as I've spent a few hours debugging this.
If you use socket_create / socket_bind with Unix domain sockets, then using socket_close at the end is not sufficient. You will get "address already in use" the second time you run your script. Call unlink on the file that is used for Unix domain sockets, preferably before you start to create the socket.
<?php
$socket_file = "./test.sock";
if (file_exists($socket_file))
unlink($socket_file);
# optional file lock
$socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
# ... socket_set_option ...
socket_bind($socket, $socket_file);
# ...
socket_close($socket);
# optional : release lock
unlink($socket_file);
?>
The aforementioned tidbit about using NULL to bind to all addresses did not work for me, as I would receive an error about unknown address. Using a 0 worked for me:
socket_bind ($socket, 0, $port)
This also allows you to receive UDP broadcasts, which is what I had been trying to figure out.
When doing Unix sockets, it might be necessary to chmod the socket file so as to give Write permission to Group and/or Others. Otherwise, only the owner is allowed to write data into the stream.
Example:
<?php
$sockpath = '/tmp/my.sock';
socket_bind($socket, $sockpath);
//here: write-only (socket_send) to others, only owner can fetch data.
chmod($sockpath, 0702);
?>
It appears for the $address parameter:
'127.0.0.1'
accepts clients from localhost (eg. 127.0.0.1)
'0.0.0.0'
accepts clients from localhost, and the server's network (eg. 127.0.0.1, 192.168.2.5, 10.20.30.40)
'0' or 0
accepts clients from localhost, the server's network, and external networks (eg. 127.0.0.1, 192.168.2.5, 10.20.30.40, 209.85.169.99)
