PHP: what is pcntl_signal used for?

Question

I found a piece of code that I had not seen before:

declare(ticks = 1);
pcntl_signal(SIGINT, array($this, "catchSignal"));
pcntl_signal(SIGTERM, array($this, "catchSignal"));

I looked at the function in the PHP documentation, but I still don’t understand what it is used for. Please help me understand why this is used, and some examples of where this should be implemented.

Answer 1

The declare statement declares that it checks events for each tick. A tick is approximately equal to a line of code. This is used in PHP command line scripts so that you can interrupt interrupts and disable the script, rather than just killing it.

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Answer 2

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Answer 3

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pcntl_signal - PHP.