diff --git a/elabora.php b/elabora.php
index ce5bb60..de3d753 100644
--- a/elabora.php
+++ b/elabora.php
@@ -135,7 +135,7 @@ $codRaw = implode($codCognome) . implode($codNome) . $codAnno . $codMese . $codG
 //Calcolo carattere di controllo
 //Caratteri pari
 $sumPari=0;
-for($i=1;$i<count($codRaw);$i+=2){
+for($i=1;$i<strlen($codRaw);$i+=2){
     switch($codRaw[$i]){
         case '0':
             $sumPari+=0;
@@ -252,7 +252,7 @@ for($i=1;$i<count($codRaw);$i+=2){
 
 $sumDispari=0;
 //Caratteri dispari
-for($i=0;$i<count($codRaw);$i+=2){
+for($i=0;$i<strlen($codRaw);$i+=2){
     switch($codRaw[$i]){
         case '0':
             $sumDispari+=1;
@@ -366,6 +366,9 @@ for($i=0;$i<count($codRaw);$i+=2){
             break;
     }
 }
+//Calcolo codice di controllo
+$modControllo = ($sumPari + $sumDispari) % 26;
+
 ?>
 <!DOCTYPE html>
 <html lang="it">
