(PHP 4 >= 4.3.0, PHP 5)

pcntl_alarm --  Set an alarm clock for delivery of a signal


int pcntl_alarm ( int seconds)

The pcntl_alarm() function creates a timer that will send a SIGALRM signal to the process after seconds seconds. If seconds is zero, no new alarm is created. Any call to pcntl_alarm() will cancel any previously set alarm.

pcntl_alarm() will return the time in seconds that any previously scheduled alarm had remaining before it was to be delivered, or 0 if there was no previously scheduled alarm.

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