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The goal of this PR is to provide a method to filter update messages using a custom callback which solves #527.
It is mentioned in php-telegram-bot/telegram-bot-manager#33 (comment) that this might be implemented in the telegram bot manager, I don't use the bot manager currently and only need the core running on my raspberry pi.
Summary
A new method
setUpdateFilter($callback)
is introduced.If the $callback returns false, the executed of processUpdate() ends with a ServerResponse where isOk() returns false.The given test case demonstrates the usage.