PHP Files[] validation query

Hi,

i have createed a form to upload .jpg files onto my sever. I am trying to validate whether the file i upload is already existing on my server. I already have a .jpg image on my server but what i am doing is trying to check if the file i upload already exists in my server. For some reason, when i upload any .jpg file it always seems to go into my success message even if the file i upload already exists. Can somebody tel me why?

    $target = 'Shanghai_2010/images/';
    $target .= basename($_FILES['photo']['name']);
    
 echo($target);


   if(!file_exists($target))
    {
        $error = 'This file already exists on the server';
        include 'error.html.php';
        exit();
    }
    else
    {
        
        // move file to server
        echo 'success this file does not exist on server';
        echo($target);
    }

PHP:

I've been doing a bit of debugging to see the value after join the URL to my filename but the value seems fine. However, in my else statement it does not echo my $target variable.
Can somebody help

 

You have to echos and no isset($_FILES

 

Thanks for the reply, i'm assuimg that the isset is the 'outer' if statement? As i did:


if(isset($_FILES['photo']))
{
if(!file_exists($target))
{
$error = 'This file already exists on the server';
include 'error.html.php';
exit();
}
else
{

// move file to server
echo 'success this file does not exist on server';
//echo($target);
}
}


Here is also the form:

<form enctype="multipart/form-data" action=" " method="post">        
        <div>
        <label for="description"> Description: </label> <input type="text" name="description" id="description" /> <br >
        </div>
        
        <div>
            <label for="category"> Category </label>
            <select name="category" id="category">
                    <option value="Cheng_Huang_Temple">Cheng Huang Temple </option>
                    <option value="Shanghai_Zoo">Shanghai Zoo </option>
            </select> <br />
        </div>
        
        <div>
            <label for="uploadimg"> Upload Photo: </label>
         <input type="file" id="photo" name="photo" /> <br >
        </div>
        
        <div>
        <input type="hidden" name="action" value="upload" />
        <input type="submit" value="Upload" />
        </div>
    </form>

Code (markup):

if so, it still goes inton my success message