src/Interval.php
public function getStepIncrement()
    {
        switch ($this->step) {
            case self::$YEARLY:
                return '+1 year';
                break;
            case self::$MONTHLY:
                return '+1 month';
                break;
            case self::$DAILY:
                return '+1 day';
                break;
            case self::$HOURLY:
                return '+1 hour';
                break;
        }
    }
public function getStepIncrement()
    {
        switch ($this->step) {
            case self::$YEARLY:
                return '+1 year';
                break;
            case self::$MONTHLY:
                return '+1 month';
                break;
            case self::$DAILY:
                return '+1 day';
                break;
            case self::$HOURLY:
                return '+1 hour';
                break;
        }
    }
public function getStepIncrement ( ) { switch ( $ this -> step ) { case self :: $ YEARLY : return '+1 year' ; break ; case self :: $ MONTHLY : return '+1 month' ; break ; case self :: $ DAILY : return '+1 day' ; break ; case self :: $ HOURLY : return '+1 hour' ; break ; } }
Get the string corresponding to the incrementation of each steps

@return string
Get the string corresponding to the incrementation of each steps