stream_get_wrappers

<?

$return = stream_get_wrappers();

print_r($return);

Array
(
    [0] => https
    [1] => ftps
    [2] => compress.zlib
    [3] => compress.bzip2
    [4] => php
    [5] => file
    [6] => glob
    [7] => data
    [8] => http
    [9] => ftp
    [10] => phar
    [11] => zip
)