PHP 8.1 RFC: Deprecate ticks

RFC Title	Deprecate ticks
Change Type	Deprecation
Target Version	PHP 8.1
Created on	2021-05-11
Last Updated on	2021-07-02
RFC Status	Withdrawn

Ticks allow running a function “for every N low-level tickable statements”. Historically, they have been used for handling pcntl signals. However, they have outlived their usefulness and this RFC proposes to deprecate and remove them.

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