Hi I am creating a system that processes and ID and a UID, The UID we are generating randomly but I am a little stuck, I need to always generate a UID that does not currently exist in the db as the field is a unique field used on the front end so as not to expose the real ID.
So to recap, I am trying to generate a unique id that does not currently exist in the DB the part I haven't got working is the cross checking in the db so it sometimes will give a number that already exists in the db even though it shouldn't thanks in advance.
This is my code so far:
function uniqueID($table)
{
$db = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
$possible = '1234567890';
$code = '';
$characters = mt_rand(7,14);
$i = 0;
while($i < $characters)
{
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
$result = $db->query('
SELECT uniqueID
FROM '.$table.'
WHERE uniqueID = "'.$code.'"
LIMIT 1
');
$totalRows = $result->num_rows;
if(!$result)
{
return $db->error;
}
else
{
if($totalRows > 0)
{
return uniqueID($table);
}
else
{
return $code;
}
}
}
I figured out what the problem was already, As I mentioned to everyone the code generation was not the issue! The issue was that the cross check was not working correctly. So all I did was removed this loop
while($i < $characters)
{
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
As this was causing my unique ID to end up wrong.