mysql - How to solve Notice: Undefined index: id in C:xampphtdocsinvmgtmanufactured_goodschange.php on line 21

I have a problem with my PHP code saying that "Notice: Undefined index" I am sure its very simple, since I am a beginner i am not getting well what is wrong exactly so please help me.

Here's the code

    
    $id=$_GET['id']; 


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

        ?>


  


















   
   
 Item Name
     
  
     
    
    
     
Unit price 
  
 
  
    
  
 
          
      
     
 
                
   

Answer

You are not getting value of $id=$_GET['id'];

And you are using it (before it gets initialised).

Use php's in built isset() function to check whether the variable is
defied or not.

So, please update the line to:

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