Mini Shell

<?php
require_once("../config.php");
cookiecheck();
?>
<?php 
$course_id=$_POST['course_id'];
$year = $_POST['year'];
$i = 0;
$data=$conn->prepare("select DISTINCT chapter_id, subject_id from test_papers where year=$year and course_id=$course_id");
$data->execute();$result=$data->fetchall();
foreach ($result as $row) {
	$subject_id = $row['subject_id'];
	$data=$conn->prepare("select subject_name from subjects where subject_id=$subject_id");
	$data->execute();$result1=$data->fetchall();
	foreach ($result1 as $row1) {
		if($i == 0){
			echo "<div>".$row1['subject_name']."</div>";
		}
		$i++;
		$chapter_id = $row['chapter_id'];
		$data=$conn->prepare("select chapter_name from chapters where chapter_id=$chapter_id");
		$data->execute();$result2=$data->fetchall();
		foreach ($result2 as $row2) {
			$cls = ($i % 2 == 0) ? 'left_side' : 'right_side';
			echo "<div class='chapter_box ".$cls."'>";
			echo "<div class='chapter_heading'>" .$row2['chapter_name']. "</div>";
			$data=$conn->prepare("select * from test_papers where year=$year and chapter_id=$chapter_id");
		    $data->execute();$result3=$data->fetchall();
		    echo "<div class='question_box'>";
		    foreach ($result3 as $row3) {
				// echo "<a href='test_question.php?que=".$row3['id']."'>".$row3['question']."</a>";
				echo "<a href='#'>".$row3['question']."</a>";
				echo "<br/>";	
		    }
		    echo "</div></div>";
		}
	}
}
?>
<style type="text/css">
.chapter_box {
	border: 1px solid #ccc;
	width: calc(50% - 20px);
	float: left;
	margin-bottom: 10px;
	margin-right: 20px;
}
.chapter_heading {
	padding-left: 5px;
	border-bottom: 1px solid #ccc;
	font-weight: bold;
	padding-top: 3px;
	padding-bottom: 3px;
}
.question_box {
	padding-top: 5px;
	padding-left: 30px;
	padding-bottom: 5px;
}
</style>