PHP 7.0.6 Released

    Socket context options

    Socket context options — Socket context option listing

    Description

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

    Options

    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 ip:port for IPv4 addresses, and [ip]:port for IPv6 addresses. Setting the IP or the port to 0 will let the system choose the IP and/or port.

    Note:

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

    backlog

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

    Note:

    This is only applicable to stream_socket_server().

    Changelog

    Version Description
    5.3.3 Added backlog.
    5.1.0 Added bindto.

    Examples

    Example #1 Basic bindto 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);

    ?>

    User Contributed Notes

    guru at jnt-finland dot fi
    6 months ago
    You can set "bindto" to "0:0" to force use IPv4 instead of IPv6. And probably "[0]:0" to force use IPv6, thou this I couldn't test.
    Anonymous
    9 months ago
    Well we can:
    set a Context and just read a "file"...
    open a socket an read/write to a "file"

    no i have a selfsigned cert ( it is in /usr/ssl... ) but after upgrading to 5.6 some Errors came thru.

    no i have to downgrad php... so i'm now less secure to be "more" secure ...
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