.csv, and mirrors the response headers // seen in the surrogate net-log from the field capture: // // HTTP/1.1 200 OK // Content-Type: text/csv // Content-Length: 94617 // Content-Disposition: attachment; filename=results_2026-08-24T03-39-11.csv // Cache-Control: no-cache // // The filename is timestamped on every request, as the dashboard's is, so a // repeat download cannot be served from cache or collide on disk. // // ?size= body size, default 94617 (the size in the capture) // ?delay_ms= spread the body over this many ms, as attachment_pdf_slow // does, to push completion past the activation window set_time_limit(0); $target_size = isset($_GET['size']) ? intval($_GET['size']) : 94617; $delay_ms = isset($_GET['delay_ms']) ? intval($_GET['delay_ms']) : 0; $body = "attendance_id,arrival_time,triage_category,disposition,ward,los_minutes\n"; $row_no = 0; while (true) { $row_no += 1; $row = sprintf("A%06d,2026-06-11T%02d:%02d:%02d,P%d,%s,W%02d,%d\n", $row_no, $row_no % 24, $row_no % 60, ($row_no * 7) % 60, ($row_no % 4) + 1, ($row_no % 2) ? "Admitted" : "Discharged", ($row_no % 12) + 1, ($row_no * 13) % 480); if (strlen($body) + strlen($row) > $target_size) { break; } $body .= $row; } // Whole rows rarely land on @target_size exactly. Pad the last field with // spaces rather than truncating, so the body is byte-exact and every row is // still parseable as CSV. $pad = $target_size - strlen($body); if ($pad > 0) { $body = substr($body, 0, -1) . str_repeat(' ', $pad) . "\n"; } $filename = "results_" . gmdate("Y-m-d\TH-i-s") . ".csv"; header("HTTP/1.1 200 OK"); header("Content-Type: text/csv"); header("Content-Disposition: attachment; filename=" . $filename); header("Content-Length: " . strlen($body)); header("Cache-Control: no-cache"); if ($delay_ms <= 0) { echo $body; } else { $chunks = 20; $chunk_size = (int)ceil(strlen($body) / $chunks); $chunk_delay_us = intval($delay_ms * 1000 / $chunks); for ($offset = 0; $offset < strlen($body); $offset += $chunk_size) { echo substr($body, $offset, $chunk_size); flush(); usleep($chunk_delay_us); } } ?>