[PHP]Get Next Business Day, include/not include holiday

GetNextBusinessDay.php

<?php
/**
 * One of my task is to create a function that find the next business day.
 * 
 * Reference: https://stackoverflow.com/a/5532070/1802483
 */
class GetNextBusinessDay{
  //   Get a list of holiday in https://holidayapi.com/.  Then I copy, paste and edit it manually to make this list
  private $holidayList = [
        "2020-04-04",
        "2020-04-10",
        "2020-04-11",
        "2020-04-12",
        "2020-04-13",
        "2020-04-30",
        "2020-05-01",
        "2020-05-10",
        "2020-06-20",
        "2020-06-21",
        "2020-06-25",
  ];
  
  private $returnDateFormat = "Ymd";
  
  public function find($tmpDate){
      // T+2 (business date), if you need T + x (current day plus some number of days), you can edit it here.
      // In my case since I am using T+2, so I put $i + 2
      $i = 1 + 2;

      // Need to have more limit: before 5:00pm, if current time is bigger than deadLine, move to next day
      // if you need it you can keep it, or you can remove it.  :D
      $deadLine = strtotime(date("Y-m-d 17:00", strtotime($tmpDate)));

      if(strtotime("now") >= $deadLine){
          $i += 1;
      }

      // The core of this script is "+x Weekday"
      $nextBusinessDay = date($this->returnDateFormat, strtotime($tmpDate . ' +' . $i . ' Weekday'));

      // If the date is in the holidayList above, move to next day, and check again
      // Include this checking if you need to verify date with your holiday list, 
      // or you can just comment it to remove.
      while (in_array($nextBusinessDay, $this->holidayList)) {
          $i++;
          $nextBusinessDay = date($this->returnDateFormat, strtotime($tmpDate . ' +' . $i . ' Weekday'));
      }

      return $nextBusinessDay;
  }
}

I know I can make it more elegant and simple, and class/object oriented. But I think it is just enough for people to understand the login behind.

Hope it helps someone.