(PHP 5, PHP 7)
stream_get_transports — Retrieve list of registered socket transports
stream_get_transports ( ) : array
Returns an indexed array containing the name of all socket transports available on the running system.
Returns an indexed array of socket transports names.
Example #1 Using stream_get_transports()
<?php $xportlist = stream_get_transports(); print_r($xportlist); ?>
The above example will output something similar to:
Array ( [0] => tcp [1] => udp [2] => unix [3] => udg )
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https://www.php.net/manual/en/function.stream-get-transports.php