php function tanggal

//example : time_elapsed_string(date("2020-02-12 10:25:00"));
//example : time_elapsed_string(date('Y-m-d H:i:s'));
function time_elapsed_string($datetime, $lang=false,$full = false) {
        $now = new DateTime;
        $ago = new DateTime($datetime);
        $diff = $now->diff($ago);

        $diff->w = floor($diff->d / 7);
        $diff->d -= $diff->w * 7;

        if(empty($lang)){
            $string = array(
                'y' => 'tahun',
                'm' => 'bulan',
                'w' => 'minggu',
                'd' => 'hari',
                'h' => 'jam',
                'i' => 'menit',
                's' => 'detik',
             );

            $ago  = " yang lalu";
            $just = " saat ini";
            $ss   =  "";
        }
        else if($lang=="en"){
            $string = array(
                'y' => 'year',
                'm' => 'month',
                'w' => 'week',
                'd' => 'day',
                'h' => 'hour',
                'i' => 'minute',
                's' => 'second',
             );

            $ago  = " ago";
            $just = " just now";
            $ss   =  "s";
        }


        foreach ($string as $k => &$v) {
            if ($diff->$k) {
                $v = $diff->$k . ' ' . $v . ($diff->$k > 1 ? $ss : '');
            } else {
                unset($string[$k]);
            }
        }

        if (!$full) $string = array_slice($string, 0, 1);
        return $string ? implode(', ', $string) . $ago : $just;
}

//example : get_hari('2018-03-30')
    function get_hari($tanggal){  //Only format yyyy-mm-dd
        $day = date('D', strtotime($tanggal));
        $dayList = array(
            'Sun' => 'Minggu',
            'Mon' => 'Senin',
            'Tue' => 'Selasa',
            'Wed' => 'Rabu',
            'Thu' => 'Kamis',
            'Fri' => 'Jumat',
            'Sat' => 'Sabtu'
        );
        return $dayList[$day]; //output data => Day Name
}

//example : get_date_indonesia('2018-03-30','all')
    function get_date_indonesia($date,$jns=''){   //Only format yyyy-mm-dd
        $BulanIndo = array("Januari", "Februari", "Maret", "April", "Mei", "Juni", "Juli", "Agustus", "September", "Oktober", "November", "Desember");

        $tahun = substr($date, 0, 4);
        $bulan = substr($date, 5, 2);
        $tgl   = substr($date, 8, 2);

        if($jns=="all"){
            $result = $tgl . " " . $BulanIndo[(int)$bulan-1] . " ". $tahun;
            // output data =>  dd, month name yyyy
        }
        else if($jns=="month"){
            $result = $BulanIndo[(int)$bulan-1];   // output data => month name
        }
        else if($jns=="month_year"){
            $result = $BulanIndo[(int)$bulan-1] . " ". $tahun; // output data=> month name  yyyy
        }
        else {
            $newDate = date("d/m/Y", strtotime($date));
            if($date==null or $date==""){
                return "";
            }
            else {
                return $newDate;  // output data =>  dd/mm/yyyy
            }
        }
        return($result);
    }