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<?php include("includes/db_config.php"); 
if (isset($_POST['submit'])) {
  //extract($_POST);
  //var_dump($_POST);exit();
   date_default_timezone_set('Asia/Kolkata');
   $datas=mysqli_real_escape_string($conn,$_POST['data']);
$data = htmlentities($datas);
$id=$_POST["id"];
$sql1 ="UPDATE  contact_address  SET address='$data'  WHERE id='$id'"; 
$res=mysqli_query($conn,$sql1) or die(mysqli_error());
    if($res){
    echo "<script>window.location.href='contact-address.php'</script>";
    }
 
}
 include("includes/css.php")?>

<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"> 
									<h3 class="box-title">Edit Address</h3> 
							</div>
							
							<div class="box-body">
								<form method="post" action="">
									 <?php $idd=$_GET['editid'];
									 $sql2="SELECT * from contact_address where id='$idd' ";
                                                    $exe2=mysqli_query($conn,$sql2);
                                                    while ($res=mysqli_fetch_array($exe2))
                                                    { ?>
									<div class="form-group">  
										<div class="col-md-12">
											<label>Address :</label>
											<div class="input-group">
												<div class="input-group-addon">
													<i class="fa fa-suitcase"></i>
												</div>
												<textarea name="data" id="editor"  style="height:200px"><?php echo html_entity_decode($res['address']);  ?></textarea>
											</div>
										</div> 
										  <input type="hidden" class="form-control" value="<?php echo $res['id']; ?>" name="id" >
										<div class="clearfix"></div> 
										<div class="col-md-2">
											<input type="submit" name="submit" class="btn btn-success btn-md btn-search mt-30" value="Add Data">
										</div>
									</div>
								<?php } ?>
								</form>
							</div>
						</div>
					</div>
				</div>
			</section>
		</div>
		<?php include("includes/footer.php")?>
	</div>
	<?php include("includes/js.php")?>
</body>

</html>

Editing File: edit_contact_us.php