Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\MINI PROJECT\CDP\presentationlayer\doctor\index2.php on line 38
The error above is what i get when i click on the doctor's info on my website and it is same for 41,44,47,50.
below is the code;
<?php include ('../../datalayer/server.php'); ?>
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Doctor</title>
<link rel="stylesheet" href="style3.css">
<link href="https://fonts.googleapis.com/css2?family=Alfa+Slab+One&family=Open+Sans:wght@300&display=swap" rel="stylesheet">
</head>
<header>
<h1 >Doctor<span>Patient</span></h1>
<nav>
<ul>
<li><a href="index2.php">MyInfo</a></li>
<li><a href="doctorapp.php">My Appointments</a></li>
<li><a href=" searchpatient.php">Search Patient</a></li>
<li><a href="add.php">Add Description</a></li>
<li><a href="../../consultant/consultant.html">Logout</a></li>
</ul>
</nav>
</header>
<body>
<div class="header">
<h2>My Information</h2>
</div>
<form method="post" action="index2.php" class="info">
<div class="Dcontent">
<label>ID: <?php echo "" .isset($_SESSION['DoctorID']);?></label>
<br>
<br>
38. <label> Email : <?php echo $colD['email']; ?></label>
<br>
<br>
41. <label> Name : <?php echo $colD['Doctorname']; ?></label>
<br>
<br>
44. <label> Address : <?php echo $colD['Address']; ?></label>
<br>
<br>
47. <label> Contact Number : <?php echo $colD['ContactNumber']; ?></label>
<br>
<br>
50. <label> Specialized In : <?php echo $colD['category']; ?></label>
<br>
<br>
</div>
</form>
<!--<div class="footer">
<div id="copyright"><small>© 2021 Kwame Nkrumah University of Science & Technology.</small></div>
</div>-->
</body>
</html>
$colDvariable is null