Description:
------------
When I'm opening several file descriptors (resource id's) with fopen or any other resource type, the resource id keeps increasing even when I close "previous" resource id's.

For example in a server/client example with stream sockets:

Client connects to the server...stream_socket_accept();
Client fd: Resource id #1
client quits.... fclose/socket_close
Client connects to the server...stream_socket_accept();
Client fd: Resource id #2
client quits.... fclose/socket_close
...
...
...
Client connects to the server...stream_socket_accept();
Client fd: Resource id #12456

Shouldn't the resource id reset to #1 when the second client
connected ?

Reproduce code:
---------------
<?php
set_time_limit(0);
ob_implicit_flush();

while (true) {
  testit();
}
function testit() {
        $fp = fopen('test','w');
        print("Res: ".$fp."\n");
        fclose($fp);
}
?>


Expected result:
----------------
Res: Resource id #1
Res: Resource id #1
Res: Resource id #1
....
....
Res: Resource id #1

Actual result:
--------------
Res: Resource id #1
Res: Resource id #2
Res: Resource id #3
....
....
Res: Resource id #20000