The kill() method has been removed from PECL pthreads library version 3.
See manual from archive: https://web.archive.org/web/20210410123359/https://www.php.net/manual/en/thread.kill.php
Warning: This method has been removed in pthreads v3.
Warning: The programmer should not ordinarily kill Threads by force.
So as you can see removed in new version: https://www.php.net/manual/en/class.thread.php
Now what’s alternate for kill or terminate the proccess from out of class that started with the Thread class?
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Answer
There is no alternative. This method was removed exactly because it’s not safe to kill a thread like this using pthreads. Check this and this issue in the pthreads repository for more details and possible workarounds.
Since pthreads was discontinued, I recommend switching to the new parallel extension. It has a kill method.