PHP中实现crontab代码分享

1. 准备一个标准crontab文件 ./crontab

https://github.com/jkonieczny/PHP-Crontab */
class Crontab {
   /**
* Finds next execution time(stamp) parsin crontab syntax,
* after given starting timestamp (or current time if ommited)
*
* @param string $_cron_string:
*
* 0 1 2 3 4
* * * * * *
* - - - - -
* | | | | |
* | | | | +----- day of week (0 - 6) (Sunday=0)
* | | | +------- month (1 - 12)
* | | +--------- day of month (1 - 31)
* | +----------- hour (0 - 23)
* +------------- min (0 - 59)
* @param int $_after_timestamp timestamp [default=current timestamp]
* @return int unix timestamp - next execution time will be greater
* than given timestamp (defaults to the current timestamp)
* @throws InvalidArgumentException
*/
    public static function parse($_cron_string,$_after_timestamp=null)
    {
        if(!preg_match('/^((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)\s+((\*(\/[0-9]+)?)|[0-9\-\,\/]+)$/i',trim($_cron_string))){
            throw new InvalidArgumentException("Invalid cron string: ".$_cron_string);
        }
        if($_after_timestamp && !is_numeric($_after_timestamp)){
            throw new InvalidArgumentException("\$_after_timestamp must be a valid unix timestamp ($_after_timestamp given)");
        }
        $cron = preg_split("/[\s]+/i",trim($_cron_string));
        $start = empty($_after_timestamp)?time():$_after_timestamp;

        $date = array( 'minutes' =>self::_parseCronNumbers($cron[0],0,59),
                            'hours' =>self::_parseCronNumbers($cron[1],0,23),
                            'dom' =>self::_parseCronNumbers($cron[2],1,31),
                            'month' =>self::_parseCronNumbers($cron[3],1,12),
                            'dow' =>self::_parseCronNumbers($cron[4],0,6),
                        );
        // limited to time()+366 - no need to check more than 1year ahead
        for($i=0;$i<=60*60*24*366;$i+=60){
            if( in_array(intval(date('j',$start+$i)),$date['dom']) &&
                in_array(intval(date('n',$start+$i)),$date['month']) &&
                in_array(intval(date('w',$start+$i)),$date['dow']) &&
                in_array(intval(date('G',$start+$i)),$date['hours']) &&
                in_array(intval(date('i',$start+$i)),$date['minutes'])

                ){
                    return $start+$i;
            }
        }
        return null;
    }

    /**
* get a single cron style notation and parse it into numeric value
*
* @param string $s cron string element
* @param int $min minimum possible value
* @param int $max maximum possible value
* @return int parsed number
*/
    protected static function _parseCronNumbers($s,$min,$max)
    {
        $result = array();

        $v = explode(',',$s);
        foreach($v as $vv){
            $vvv = explode('/',$vv);
            $step = empty($vvv[1])?1:$vvv[1];
            $vvvv = explode('-',$vvv[0]);
            $_min = count($vvvv)==2?$vvvv[0]:($vvv[0]=='*'?$min:$vvv[0]);
            $_max = count($vvvv)==2?$vvvv[1]:($vvv[0]=='*'?$max:$vvv[0]);

            for($i=$_min;$i<=$_max;$i+=$step){
                $result[$i]=intval($i);
            }
        }
        ksort($result);
        return $result;
    }
}

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