https://www.php.net/manual/en/function.stream-socket-pair.php
PHP: stream_socket_pair - Manual
Creates a pair of connected, indistinguishable socket streams
php streamsocket pairmanual
https://www.php.net/socket-create-pair
PHP: socket_create_pair - Manual
Creates a pair of indistinguishable sockets and stores them in an array
phpsocketcreatepairmanual
https://www.banggood.com/20-Pair-40-Pin-Header-2_54mm-Male-Female-SIL-Socket-Row-Strip-PCB-Connector-reviews-p953434.html
20 Pair 40 Pin Header 2.54mm Male Female SIL Socket Row Strip PCB Connector Reviews - Banggood...
Shop best 20 Pair 40 Pin Header 2.54mm Male Female SIL Socket Row Strip PCB Connector at the guaranteed lowest price. Get the best deals on Banggood.com
https://www.campingworld.com/whitecap-rowlock-socket-pair-314636.html?cgid=kayaking-gear
Whitecap Rowlock Socket, Pair
Sockets have a plastic bearing for smooth operation.
whitecaprowlocksocketpair