public function byday($bywdaylist, $delimiter = ",")
{
if (is_string($bywdaylist) && strpos($bywdaylist, $delimiter) !== false) {
// remove any accidental delimiters
$bywdaylist = trim($bywdaylist, $delimiter);
$bywdaylist = explode($delimiter, $bywdaylist);
} else {
if (is_string($bywdaylist)) {
// remove any accidental delimiters
$bywdaylist = trim($bywdaylist, $delimiter);
$bywdaylist = array($bywdaylist);
}
}
if (is_array($bywdaylist) && Valid::daysList($bywdaylist)) {
$this->bydays = self::createDaysList($bywdaylist);
return $this;
}
throw new \InvalidArgumentException("bydays: Accepts (optional) positive and negative values between 1 and 53 followed by a valid week day");
}