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<?php include("includes/css.php");
if (isset($_POST['stsubmit'])) {
extract($_POST);
  $user_id=$_GET['id'];
$sql1 ="UPDATE  student  SET religion='$religion',caste='$caste',nationality='$nationality',document='$document',document_no='$document_no',community='$community'  WHERE id='$user_id'"; 
$res=mysqli_query($conn,$sql1) or die(mysqli_error());
if($res){
$sqlg = "SELECT * from student where id = '$user_id'";
$resultg = mysqli_query($conn,$sqlg) or die(mysqli_error());
$resg = mysqli_fetch_object($resultg);
  if($_FILES["image"]["name"] != ""){
	$oname=$_FILES["image"]["name"];
	$pos = strrpos($oname, ".");
	$extension=substr($oname,$pos+1);
	$tn = $_FILES["image"]["tmp_name"];
	$path = "../profile/document/".$resg->id.'.'.$extension;
	$upath = "../profile/document/".$resg->document_img;
	unlink($upath);
	 move_uploaded_file($tn,$path);
	  $aimage = $resg->id.'.'.$extension;
	} else {
	  $aimage = $resg->document_img;
	}
 
$sqlup = "UPDATE student SET  document_img ='$aimage' WHERE  id = $resg->id";
$resultup = mysqli_query($conn,$sqlup) or die(mysqli_error()); 
}
}
?>
<body class="hold-transition skin-blue sidebar-mini">
    <div class="wrapper">
        <?php include("includes/header.php");?>
        <?php include("includes/sidebar.php");?>
        
        <div class="content-wrapper">
            
            
            <section class="content">
                <div class="row">
                    <div class="col-md-12">
                        <div class="box box-primary">
                            <div class="box-header with-border">
							  <div class="col-md-7">
                                    <h3 class="box-title">Personal & Contact Details:</h3>
                                </div>
                            </div> 
							<div class="box-header with-border">
								<?php include("includes/student-profile-menu.php");?>
                            </div>
                            	<?php   $user_id=$_GET['id'];
									$sql=mysqli_query($conn,"select * from student where id='$user_id'");
									$res= mysqli_fetch_array($sql); 	?>
										
                            
                            <div class="box-body">
								<div class="row">
                                <form class="form-horizontal" action="" method="post" enctype="multipart/form-data">
                                    
                                   
                                     <div class="col-md-6">
										<div class="form-group">
											<label class="control-label col-md-4">Religion</label>
											<div class="col-md-8"> 
												<input class="form-control" value="<?= $res['religion']; ?>" placeholder="Religion" name="religion" type="text">   
											</div>
										</div>
                                     </div>
                                     <div class="col-md-6">
										<div class="form-group">
											<label class="control-label col-md-4">Caste</label>
											<div class="col-md-8">
												 <select class="form-control" name="caste">
													<option value="<?= $res['caste']; ?>" ><?= $res['caste']; ?></option>
													<option >General</option>
													<option >OBC</option> 
													<option >SC</option> 
													<option >ST</option> 
												</select>										 
											</div> 
										</div>
                                     </div>
                                     <div class="col-md-6">
										<div class="form-group">
											<label class="control-label col-md-4">Nationality</label>
											<div class="col-md-8">
												 <select class="form-control" name="nationality">
													<option value="<?= $res['nationality']; ?>" ><?= $res['nationality']; ?></option>
													<option >Indian</option>
													<option >Other</option>  
												</select>									 
											</div> 
										</div>
                                     </div> 
									 <div class="col-md-6">
										<div class="form-group">
											<label class="control-label col-md-4">Community</label>
											<div class="col-md-8">
												<input class="form-control" name="community" value="<?= $res['community']; ?>" placeholder="Community" type="text">  
											</div> 
										</div>
                                     </div> 
									 
									<div class="col-md-6">
										<div class="form-group">
											<label class="control-label col-md-4 text-left">Select Document</label>
											<div class="col-md-8">
												<select class="form-control" name="document">
													<option value="<?= $res['document']; ?>" ><?= $res['document']; ?></option>
													<option >Adhaar Card</option>
													<option >Birth Certificate</option>  
												</select>
												<input class="form-control mt-5" name="document_no" value="<?= $res['document_no']; ?>" type="text" placeholder="Select Id No."> 
											</div>
										</div> 
									 </div> 
									 <div class="col-md-6">
										<div class="form-group">
											<label class="control-label col-md-4 text-left">Upload Document</label>
											<div class="col-md-8">
												<input name="image" type="file" class="form-control"> </span>  
											</div>
										</div> 										 
									</div> 										 
									
									<div class="col-md-offset-1 col-md-3">
										<button type="submit" class="btn btn-success btn-lg mt-20" name="stsubmit"><i class="fa fa-check"></i> Update</button> 
									</div>
								</form>
							</div> 
						</div>
					</div>
				</div> 
			</div>
		</section>
    </div>
	<?php include("includes/footer.php");?>
	</div>
	<?php include("includes/js.php");?>
</body>

</html>

Editing File: student-personal-details.php