How to Build a Production-Ready PHP Function for Telegram Bot API Requests

A technical tutorial published on DEV Community outlines how to send Telegram Bot API messages using raw PHP and cURL instead of relying on simple file_get_contents() calls. The guide covers three critical failure layers developers must handle: cURL transport errors, non-200 HTTP status codes, and Telegram API-level error payloads where the response returns ok as false. It also addresses HTML sanitization, warning that dynamic data containing special characters like angle brackets or ampersands will trigger a 400 Bad Request error from Telegram if not properly escaped. The tutorial recommends using PHP's htmlspecialchars() function with ENT_QUOTES and ENT_SUBSTITUTE flags to safely encode user inputs before inserting them into formatted message strings. Connection and execution timeouts are also configured explicitly via cURL options to ensure reliability in production environments.