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# pcntl_alarm

(PHP 4 >= 4.3.0, PHP 5)

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

## 说明

int pcntl_alarm ( int seconds )

Creates a timer that will send a `SIGALRM` signal to the process after the given number of seconds. Any call to pcntl_alarm() will cancel any previously set alarm.

## 参数

`seconds`

  The number of seconds to wait. If `seconds` is zero, no new alarm is created.

## 返回值

Returns 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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