(PHP 5 >= 5.3.0, PHP 7)
pcntl_sigtimedwait — Waits for signals, with a timeout
pcntl_sigtimedwait ( array $set [, array &$siginfo [, int $seconds = 0 [, int $nanoseconds = 0 ]]] ) : int
The pcntl_sigtimedwait() function operates in exactly the same way as pcntl_sigwaitinfo() except that it takes two additional parameters, seconds and nanoseconds, which enable an upper bound to be placed on the time for which the script is suspended.
set
Array of signals to wait for.
siginfo
The siginfo is set to an array containing information about the signal. See pcntl_sigwaitinfo().
seconds
Timeout in seconds.
nanoseconds
Timeout in nanoseconds.
On success, pcntl_sigtimedwait() returns a signal number.
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https://www.php.net/manual/en/function.pcntl-sigtimedwait.php