Description:
------------
When trying, for example, to do :

<?php
$socket = stream_socket_server('tcp://0.0.0.0', $errno, $errstr);
var_dump($errstr);
?>


We get the following output :
Warning: stream_socket_server(): unable to connect to tcp://0.0.0.0 (Failed to parse address "0.0.0.0") in /home/magicaltux/- on line 2
string(33) "Failed to parse address "0.0.0.0""

Expected result would be to have no port passed to bind, and thru having a random port allocated by the operating system (that we would later retrieve with stream_socket_get_name).

In socket_bind, the port is also optionnal.

It's still possible to get a random port by using ":0" but the no-port behaviour would be great too (and probably not too hard to implement).



Reproduce code:
---------------
<?php
$socket = stream_socket_server('tcp://0.0.0.0', $errno, $errstr);
var_dump($errstr);
?>

Expected result:
----------------
string(0) ""

Actual result:
--------------
Warning: stream_socket_server(): unable to connect to tcp://0.0.0.0 (Failed to parse address "0.0.0.0") in /home/magicaltux/- on line 2
string(33) "Failed to parse address "0.0.0.0""