How to edit & update image file in php

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<?php
include("Connection.php");
?>
<!-- select--->
<?php
$quer="SELECT * FROM `image` WHERE id='".$_GET['id']."'";
$ru=mysqli_query($connection,$quer);
$fetch=mysqli_fetch_assoc($ru)
?>
<!--update-->
<?php 
if(isset($_POST['sub']))
{
    $name=$_POST['name'];
    $file=$_FILES["img"]["name"];
    if ($file=="") {
        $run=mysqli_query($connection,"UPDATE `image` SET name='$name' WHERE id='".$_GET['id']."'");
         if ($run) {
     echo "ok";
 }
 else{
     echo "no";
 }
    }
    else{
    $tempimage=$_FILES["img"]["tmp_name"];
    $move=move_uploaded_file($tempimage,"image/".$file);
    $run=mysqli_query($connection,"UPDATE `image` SET name='$name', image='$file' WHERE id='".$_GET['id']."'");
 if ($run) {
     echo "ok";
 }
 else{
     echo "no";
 }
 }
}
?>
<table align="center" border="2px">
    <form method="POST" accept="" enctype="multipart/form-data">
        <tr>
            <th>Name</th>
            <td><input type="text" name="name" value="<?php echo $fetch['name'];?>"></td>
        </tr>
        <tr>
            <th>Image</th>
            <td><img src="image/<?php echo $fetch['image'];?>"width="100px"; height="100px";> <br>
            <input type="file" name="img">
             </td>
        </tr>
        <tr><th colspan="2"><input type="submit" name="sub" value="Insert"></th></tr>
    </form>
</table>
</body>
</html>




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