( 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.