stream_get_filters

<?

$return = stream_get_filters();

print_r($return);

?>

Array
(
    [0] => zlib.*
    [1] => bzip2.*
    [2] => convert.iconv.*
    [3] => string.rot13
    [4] => string.toupper
    [5] => string.tolower
    [6] => convert.*
    [7] => consumed
    [8] => dechunk
)