PHP中实现crontab代码分享

前端技术 2023/09/01 PHP

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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