Socket options: bindto => 0:0 throwing Invalid IP address 0

[remizyaka]

Description

It is not possible to bint to ip4 address using context options any more. In documentation:

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.

but in fact it is not allow us to put 0 for ip address.

The following code:

<?php
$url = 'https://google.com';
$ctx  = stream_context_create([
                    'socket' => [
                        'bindto'=>'0:0'
                    ],
                    'http' =>
                        [
                            'timeout' => 10,
                        ],
                ]);
                $feed = file_get_contents($url, false, $ctx);

Resulted in this output:

file_get_contents(): Invalid IP Address: 0

But I expected this output instead:

actual content of google page

PHP Version

PHP 8.2.5

Operating System

No response

[devnexen]

The script works with PHP 7.4 for example indeed. One of the key differences is the priorisation of the inet_pton's usage above inet_aton in >= PHP 8.1