Socket context options

Socket context options

Socket context option listing

Socket context options are available for all wrappers that work over sockets, like , and . tcp``http``ftp

bindto Used to specify the IP address (either IPv4 or IPv6) and/or the port number that PHP will use to access the network. The syntax is for IPv4 addresses, and for IPv6 addresses. Setting the IP or the port to will let the system choose the IP and/or port. ip:port``[ip]:port``0

Opmerking: > As FTP creates two socket connections during normal operation, the port number cannot be specified using this option.

backlogUsed to limit the number of outstanding connections in the socket's listen queue.

Opmerking: > This is only applicable to . stream_socket_server

ipv6_v6onlyOverrides the OS default regarding mapping IPv4 into IPv6.

Opmerking: > This is important in particular when trying to listen on IPv4 addresses separately while there exists a binding on . [::]

    This is only applicable to .
   `stream_socket_server`

so_reuseportAllows multiple bindings to a same ip:port pair, even from separate processes.

Opmerking: > This is only applicable to . stream_socket_server

so_broadcastEnables sending and receiving data to/from broadcast addresses.

Opmerking: > This is only applicable to . stream_socket_server

tcp_nodelay Setting this option to true will set appropriately, thus disabling the TCP Nagle algorithm. SOL_TCP,NO_DELAY=1

Voorbeeld: Basic usage example

<?php
// connect to the internet using the '192.168.0.100' IP
$opts = array(
    'socket' => array(
        'bindto' => '192.168.0.100:0',
    ),
);


// connect to the internet using the '192.168.0.100' IP and port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '192.168.0.100:7000',
    ),
);


// connect to the internet using the '2001:db8::1' IPv6 address
// and port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '[2001:db8::1]:7000',
    ),
);


// connect to the internet using port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '0:7000',
    ),
);


// create the context...
$context = stream_context_create($opts);

// ...and use it to fetch the data
echo file_get_contents('http://www.example.com', false, $context);

?>