abp002andAlejandro Borrego 48547b4a6c Reduce memory consumption of export (#9350) ...

Contributes to #6139 (export part; the import will follow in another PR)

Exporting favourites was collecting the whole file in memory. With many articles, it fails with the default PHP memory limit.

## Changes
- New `Minz_View::helperToFile()`, similar to `helperToString()`, writing the output of a helper into a file by chunks of 64 KiB instead of keeping it in memory.
- `FreshRSS_Export_Service`: the `generate*()` methods now return the path of a temporary file instead of the content, and `zip()` builds the archive from those files (`ZipArchive::addFile()` instead of `addFromString()`). Temporary files are created in `TMP_PATH` (already required to be writable) and deleted at the end of the script.
- The export is sent with `readfile()`: Web UI, `cli/export-zip-for-user.php`, `cli/export-opml-for-user.php` and the OPML export of the Google Reader API.
- Note: this changes what `FreshRSS_Export_Service` returns (a path instead of the content). All callers in the repository are updated, and I could not find any public extension using this service.

## Measurements
Peak PHP memory (`memory_get_peak_usage(true)`), SQLite database with synthetic starred articles:

| Scenario | Before | After |
|---|---|---|
| Web, export your favourites, 10,000 articles (69 MB JSON) | 136 MB (fails with the default `memory_limit` of 128 MB) | 6 MB |
| Web, ZIP (OPML + favourites + labelled articles + 4 feeds), 10,000 articles | 152 MB | 6 MB |
| CLI `export-zip-for-user.php`, 10,000 articles | 189 MB (fails with 128 MB) | 8 MB |
| Web, export your favourites, 30,000 articles (208 MB JSON) | 404 MB | 10 MB |

Co-authored-by: Alejandro Borrego <210245044+abp002@users.noreply.github.com>

2026-10-05 21:47:19 +02:00

..

ExportService.php

Reduce memory consumption of export (#9350)

2026-10-05 21:47:19 +02:00

ImportService.php

Fixes for PHPStan 2.2.16 (#9368)

2026-09-30 15:49:06 +02:00