/**
* 解析crontab的定时格式，linux只支持到分钟/，这个类支持到秒
* @param string $crontab_string :
*
* 0 1 2 3 4 5
* * * * * * *
* - - - - - -
* | | | | | |
* | | | | | +----- day of week (0 - 6) (Sunday=0)
* | | | | +----- month (1 - 12)
* | | | +------- day of month (1 - 31)
* | | +--------- hour (0 - 23)
* | +----------- min (0 - 59)
* +------------- sec (0-59)
* @param int $start_time timestamp [default=current timestamp]
* @return int unix timestamp - 下一分钟内执行是否需要执行任务，如果需要，则把需要在那几秒执行返回
* @throws InvalidArgumentException 错误信息
*/
public static function parse($crontab_string, $start_time = null)
{
if (is_array($crontab_string)) {
return self::_parse_array($crontab_string, $start_time);
}
if (!preg_match('/^((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)$/i', trim($crontab_string))) {
if (!preg_match('/^((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)\\s+((\\*(\\/[0-9]+)?)|[0-9\\-\\,\\/]+)$/i', trim($crontab_string))) {
self::$error = "Invalid cron string: " . $crontab_string;
return false;
}
}
if ($start_time && !is_numeric($start_time)) {
self::$error = "\$start_time must be a valid unix timestamp ({$start_time} given)";
return false;
}
$cron = preg_split("/[\\s]+/i", trim($crontab_string));
$start = empty($start_time) ? time() : $start_time;
if (count($cron) == 6) {
$date = array('second' => self::_parse_cron_number($cron[0], 0, 59), 'minutes' => self::_parse_cron_number($cron[1], 0, 59), 'hours' => self::_parse_cron_number($cron[2], 0, 23), 'day' => self::_parse_cron_number($cron[3], 1, 31), 'month' => self::_parse_cron_number($cron[4], 1, 12), 'week' => self::_parse_cron_number($cron[5], 0, 6));
} elseif (count($cron) == 5) {
$date = array('second' => array(1 => 1), 'minutes' => self::_parse_cron_number($cron[0], 0, 59), 'hours' => self::_parse_cron_number($cron[1], 0, 23), 'day' => self::_parse_cron_number($cron[2], 1, 31), 'month' => self::_parse_cron_number($cron[3], 1, 12), 'week' => self::_parse_cron_number($cron[4], 0, 6));
}
if (in_array(intval(date('i', $start)), $date['minutes']) && in_array(intval(date('G', $start)), $date['hours']) && in_array(intval(date('j', $start)), $date['day']) && in_array(intval(date('w', $start)), $date['week']) && in_array(intval(date('n', $start)), $date['month'])) {
return $date['second'];
}
return null;
}
