how to insert image blob and read blob mysql image using php

<?php
   if (isset($_FILES['img']) && $_FILES['img']['size'] > 0) {

      // Temporary file name stored on the server
       $tmpName  = $_FILES['img']['tmp_name']; 
       $exttype=$_FILES['image']['type'];
       $sizen=$_FILES['img']['size'];
   
      // Read the file
      $fp      = fopen($tmpName, 'r');
      $data = fread($fp, filesize($tmpName));
      $data = $data;
      fclose($fp);
     
      /*insert into mysql query after that select and show*/
     $ext = explode('/', $image_type);
     $name = 'colors';

header("Content-Type: image/gif");
echo $data;    
exit;
     
}
else {?>
  <form name="f" method="post" action="test.php" enctype="multipart/form-data">
<input type="file" name="img"  />
<input type="submit" name="test" value="imagup" />
</form>

<?php
}

?>

how to get keyboard ascii value using javascript

 how to submit form when enter key press


<script language="javascript">
function whichKey(evt) {
    if(evt.keyCode==13){
    document.f.submit();
    }
}
</script>
<form name="f" method="get" action="test1.php">
<input type="text" name="tt" onkeypress="whichKey(event);">
</form>