(PHP 5, PHP 7)
stream_get_wrappers — Retrieve list of registered streams
stream_get_wrappers ( ) : array
Retrieve list of registered streams available on the running system.
Returns an indexed array containing the name of all stream wrappers available on the running system.
Example #1 stream_get_wrappers() example
<?php print_r(stream_get_wrappers()); ?>
The above example will output something similar to:
Array
(
[0] => php
[1] => file
[2] => http
[3] => ftp
[4] => compress.bzip2
[5] => compress.zlib
)
Example #2 Checking for the existence of a stream wrapper
<?php
// check for the existence of the bzip2 stream wrapper
if (in_array('compress.bzip2', stream_get_wrappers())) {
echo 'compress.bzip2:// support enabled.';
} else {
echo 'compress.bzip2:// support not enabled.';
}
?>
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https://www.php.net/manual/en/function.stream-get-wrappers.php