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<?php include("includes/css.php");
if (isset($_POST['submit'])) {
  //extract($_POST);
  //var_dump($_POST);exit();
   date_default_timezone_set('Asia/Kolkata');
$name = htmlentities( $_POST['article']);
$id=$_POST["id"];
$sql1 ="UPDATE  about_us  SET description='$name'  WHERE id='$id'"; 
$res=mysqli_query($conn,$sql1) or die(mysqli_error());
if($res){
    $sqlg = "SELECT * from about_us where id = '$id'";
      $resultg = mysqli_query($conn,$sqlg) or die(mysqli_error());
      $resg = mysqli_fetch_object($resultg);
    
      if($_FILES["images"]["name"] != ""){
        $oname=$_FILES["images"]["name"];
        $pos = strrpos($oname, ".");
        $extension=substr($oname,$pos+1);
        $tn = $_FILES["images"]["tmp_name"];
        $path = "images/".$resg->id.'183'.'.'.$extension;
        $upath = "images/".$resg->image;
        unlink($upath);
         move_uploaded_file($tn,$path);
         $img_banner = $resg->id.'183'.'.'.$extension;
        } else {
          $img_banner = $resg->image;
        }
    $sqlup = "UPDATE about_us SET image='$img_banner' 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">
                <form name="" method="post" action=""  enctype="multipart/form-data">

<div class="row">
                    <?php   $sql2="SELECT * from about_us";
                            $exe2=mysqli_query($conn,$sql2);
                            while ($res=mysqli_fetch_array($exe2))
                            { ?>
                        <div class="box box-danger">    
                            <div class="box-header with-border">
                                <h3 class="box-title">Home About US</h3>
                            </div>
                            
                            <div class="box-body table-responsive">
                             <div class="row clear_fix">
                                <div class="col-md-12">
                                            <label>About Us Image:</label>
                                            <img src="images/<?php echo $res['image']; ?>" class="img-responsive" style="width:80px" alt="">
                                            <br>
                                            <div class="input-group">
                                                <div class="input-group-addon">
                                                    <i class="fa fa-suitcase"></i>
                                                </div>
                                                <input name="images" type="file" class="form-control"/>
                                            </div>
                                        </div> 
                                        
                        <div class="col-md-12">
                                <label>About US</label>
                              <textarea name="article" id="editor"  style="height:200px"><?php echo html_entity_decode($res['description']);  ?></textarea>
                        </div>
                    </div>
                     <input type="hidden" class="form-control" value="<?php echo $res['id']; ?>" name="id" >

<button type="submit" name="submit" id="" class="btn btn-primary pull-right">Submit</button>
                            </div>
                            
                        </div>
                    <?php } ?> 
                </div>
            </form> 
            </section>
        </div>
        <?php include("includes/footer.php")?>
    </div>
    <?php include("includes/js.php")?> 
</body>

</html>

Editing File: aboutuscms.php