Upload immagine

[BullFrog]

Buondì gente.
Sto realizzando il sito del team di football americano nel quale gioco.
Come ogni "americanata" vorremmo realizzare le schede giocatore, con immagine, dati e magari una piccola gallery dedicata.

Per la gestione dei dati personali attraverso form, nessun problema. Diverso invece per l'upload dell'immagine.
In giro ho trovato questo script:

<?php
//define a maxim size for the uploaded images in Kb
 define ("MAX_SIZE","100"); 

//This function reads the extension of the file. It is used to determine if the file  is an image by checking the extension.
 function getExtension($str) {
         $i = strrpos($str,".");
         if (!$i) { return ""; }
         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
 }

//This variable is used as a flag. The value is initialized with 0 (meaning no error  found)  
//and it will be changed to 1 if an errro occures.  
//If the error occures the file will not be uploaded.
 $errors=0;
//checks if the form has been submitted
 if(isset($_POST['Submit'])) 
 {
     //reads the name of the file the user submitted for uploading
     $image=$_FILES['image']['name'];
     //if it is not empty
     if ($image) 
     {
     //get the original name of the file from the clients machine
         $filename = stripslashes($_FILES['image']['name']);
     //get the extension of the file in a lower case format
          $extension = getExtension($filename);
         $extension = strtolower($extension);
     //if it is not a known extension, we will suppose it is an error and will not  upload the file,  
    //otherwise we will do more tests
 if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) 
         {
        //print error message
             echo '<h1>Unknown extension!</h1>';
             $errors=1;
         }
         else
         {
//get the size of the image in bytes
 //$_FILES['image']['tmp_name'] is the temporary filename of the file
 //in which the uploaded file was stored on the server
 $size=filesize($_FILES['image']['tmp_name']);

//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
{
    echo '<h1>You have exceeded the size limit!</h1>';
    $errors=1;
}

//we will give an unique name, for example the time in unix time format
$image_name=time().'.'.$extension;
//the new name will be containing the full path where will be stored (images folder)
$newname="images/".$image_name;
//we verify if the image has been uploaded, and print error instead
$copied = copy($_FILES['image']['tmp_name'], $newname);
if (!$copied) 
{
    echo '<h1>Copy unsuccessfull!</h1>';
    $errors=1;
}}}}

//If no errors registred, print the success message
 if(isset($_POST['Submit']) && !$errors) 
 {
     echo "<h1>File Uploaded Successfully! Try again!</h1>";
 }

 ?>

Usandolo carica correttamente l'immagine nella cartella, solo che vorrei rinominare l'immagine con l'ID del giocatore appena inserito.

Qualche suggerimento?

Grazie a tutti