How to solve Notice Undefined index id in C xampp htdocs invmgt manufactured goods change php on line 21

Question

I am having an error in the PHP code saying "Notice: Undefined index".

The code:

<?php require_once('../Connections/itemconn.php'); ?>
    <?php   

    $id=$_GET['id']; 

        $query=mysql_query("select * from manuf where id='$id' ")or die(mysql_error());
        $row=mysql_fetch_array($query);

        ?>

<form action="updateprice.php" method="post" enctype="multipart/form-data">
  <table align="center">
   <tr>
   <td> <label><strong>Item Name</strong></label></td>
     <td> <label> <?php echo $row['itemname']; ?></label><input type="hidden" name="id" value="<?php echo $id; ?> " />
     <br /></td>
    </tr>
    <tr>

     <td><label><strong>Unit price </strong></label></td>
  <td> <input type="text" name="pass" value="<?php echo $row['unitprice']; ?> " /><br /></td>
  </tr>

    <tr>
  <td> 
          <input type="reset" name="Reset" value="CANCEL" />
      <br></td>


     <td> 
          <input type="submit" name="Submit2" value="Update" />      </td>
   </tr>
</table>
</form>
</body>
</html>

As I am a beginner I cant solve this issue. Can someone help me with this?

Answer 1

The issue is that you are using the git id before it gets initialized. To solve this, use PHP's inbuilt isset() function to check whether the variable is defied or not.

So, update the line to:

$id = isset($_GET['id']) ? $_GET['id'] : '';

This will remove the notice that you are facing.