If you don't have the php curl library available to you, you can query Pilosa with php's file_get_contents
which is part of core php. The following php script should perform your example query:
<?php
$url = 'http://localhost:10101/index/user/query';
$data = 'Bitmap(frame="language", id=5)';
$options = array(
'http' => array(
'method' => 'POST',
'content' => $data
)
);
$context = stream_context_create($options);
$result = file_get_contents($url, false, $context);
var_dump($result);
?>
The Pilosa HTTP API documentation can be found at: https://www.pilosa.com/docs/api-reference/