$ro4 = new database4(); if (isset($_POST['month'])) { $month = $_POST['month']; } else { $month = date("m"); } if (isset($_POST['year'])) { $year = $_POST['year']; } else { $year = date("Y"); } $monthWord = array("01" => "January", "02" => "February", "03" => "March", "04" => "April", "05" => "May", "06" => "June", "07" => "July", "08" => "August", "09" => "September", "10" => "October", "11" => "November", "12" => "December"); $totalInvoice = 0; $from = $year . "-" . $month . "-" . "01"; $to = $year . "-" . $month . "-" . "31"; $ro4->list_retail($from, $to); ?> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <link rel="stylesheet" href="../../bootstrap-3.3.6/css/bootstrap.css"></link> </head> <body> <div class="container"> <h2>Retail List</h2> <form method="post" action="view-retail.php"> <div class="col-md-2"> <select class="form-control" name="month"> <option value="<?php