$arr = array("Hotel", "Room_Type", "Arrival_Month", "Checkin_Date", "Checkout_Date", "Tickets", "Marital_Status", "State", "Best_Time_to_Call", "First_Name", "Last_Name", "Spouse_Name", "Address", "City",  "Province", "Country", "Name_on_card", "Card_Type"); 
foreach ($arr as $field)
{  
    $clean["$field"] = ucwords($clean["$field"]);
}

Select all