how to find this day is holiday in php day

1function observed_date($holiday){
2    $day = date("w", strtotime($holiday));
3    if($day == 6) {
4        $observed_date = $holiday -1;
5    } elseif ($day == 0) {
6        $observed_date = $holiday +1;
7    } else {
8        $observed_date = $holiday;
9    }
10    return $observed_date;
11}
12
13function get_holiday($holiday_name) {
14
15    $currentYear = date('Y');
16
17    switch ($holiday_name) {
18        // New Years Day
19        case "new_year":
20            $holiday = observed_date(date('Ymd', strtotime("first day of january $currentYear")));
21            break;
22        // Martin Luther King, Jr. Day
23        case "mlk_day":
24            $holiday = date('Ymd', strtotime("january $currentYear third monday"));
25            break;
26        // President's Day
27        case "presidents_day":
28            $holiday = date('Ymd', strtotime("february $currentYear third monday"));
29            break;
30        // Memorial Day
31        case "memorial_day":
32            $holiday = (new DateTime("Last monday of May"))->format("Ymd");
33            break;
34        // Independence Day
35        case "independence_day":
36            $holiday = observed_date(date('Ymd', strtotime("july 4 $currentYear")));
37            break;
38        // Labor Day
39        case "labor_day":
40            $holiday = date('Ymd', strtotime("september $currentYear first monday"));
41            break;
42        // Columbus Day
43        case "columbus_day":
44            $holiday = date('Ymd', strtotime("october $currentYear second monday"));
45            break;
46        // Veteran's Day
47        case "veterans_day":
48            $holiday = observed_date(date('Ymd', strtotime("november 11 $currentYear")));
49            break;
50        // Thanksgiving Day
51        case "thanksgiving_day":
52            $holiday = date('Ymd', strtotime("november $currentYear fourth thursday"));
53            break;
54        // Christmas Day
55        case "christmas_day":
56        $holiday = observed_date(date('Ymd', strtotime("december 25 $currentYear")));
57            break;
58
59        default:
60            $holiday = "";
61            break;
62    }
63    return $holiday;
64
65}
66

1    //function that checks if a holiday lands on saturday/sunday and so we can move them to a friday/monday respectively
2    private function getObservedDate($holidayDate){
3
4        $dayofweek = date("w", strtotime($holidayDate));
5
6        if ($dayofweek == 6) $holidayDate = date('m/d/Y', strtotime("$holidayDate - 1 days")); //saturday moves to friday
7        else if ($dayofweek == 0)  $holidayDate = date('m/d/Y', strtotime("$holidayDate + 1 days"));  //sunday moves monday
8
9        return $holidayDate;
10    }
11
12
13    //function that calculates the holidays for any given year
14    private function getFederalHolidaysForYear($year){
15
16        $NY = $this->getObservedDate( date('m/d/Y', strtotime("1/1/$year")) ); //new years day
17
18        $MLK = $this->getObservedDate( date('m/d/Y', strtotime("third monday of january $year")) );  //martin luther king day
19
20        $PD = $this->getObservedDate( date('m/d/Y', strtotime("third monday of february $year")) ); ; //presidents day
21
22        $MDay = $this->getObservedDate( date('m/d/Y', strtotime("last monday of May $year")) ); //memorial day  
23
24        $IDay = $this->getObservedDate( date('m/d/Y', strtotime("7/4/$year")) );  // independence day
25
26        $LD = $this->getObservedDate( date('m/d/Y', strtotime("first monday of september $year")) ); //labor day
27
28        $VD = $this->getObservedDate( date('m/d/Y', strtotime("11/11/$year")) ); //veterans day
29
30        $ColD =$this->getObservedDate( date('m/d/Y', strtotime("second monday of october $year")) ); //columbus day   
31
32        $TG = $this->getObservedDate( date('m/d/Y', strtotime("last thursday of november $year")) ); // thanksgiving       
33
34        $CD = $this->getObservedDate( date('m/d/Y', strtotime("12/25/$year")) );  //christmas day 
35
36        $nonWorkingDays = array();
37
38        array_push($nonWorkingDays, $NY, $MLK, $PD, $MDay, $IDay, $LD, $ColD, $VD, $TG, $CD);
39
40        return $nonWorkingDays;
41    }
42