Streaming Telegram File Uploads in PHP with cURL to Prevent Memory Crashes

Naive PHP Telegram bot implementations that load whole files into memory can crash on large exports, leaving queues stalled. Re-uploading the same file to many users also wastes bandwidth and can trigger Telegram's 429 rate limits. The article recommends sending files via cURL multipart requests using CURLFile, which streams data from disk rather than buffering it in memory. It also suggests caching Telegram's file_id values for reuse and choosing public URLs over local uploads where appropriate. A complete PHP example covers MIME detection, cURL and HTTP error handling, and validation of Telegram's API responses.