ho provato così:
Codice PHP:
include('db.php');
function CreateCode($Length,$Elements) {
mt_srand((double)microtime()*1000000);
$sCode="";
for($i=0;$i<$Length;$i++)
$sCode .= $Elements[
mt_rand(0,strlen($Elements)-1) ];
return $sCode;
}
for ($j=0;$j<=25;$j++){
$codice = (CreateCode(10,"1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
mysql_query("INSERT INTO miatabella (id_codice) VALUES ('$codice')") or die("Query Fallita: " . mysql_error());
}
ma mi da errore: Query Fallita: Duplicate entry '0' for key 1
nessuno mi sa aiutare?