http_persistent_handles_count

The above example will output:

stdClass Object
(
    [http_request] => Array
        (
            [GLOBAL] => Array
                (
                    [used] => 0
                    [free] => 1
                )

        )

    [http_request_datashare] => Array
        (
            [GLOBAL] => Array
                (
                    [used] => 1
                    [free] => 0
                )

        )

    [http_request_pool] => Array
        (
        )

)