[PHP] Random Registeration number input

As the title says i want an Input like registeration number
which generates a alphanumeric 4 or 5 digit number like "ON200" or some thing like that
also a function to check if that id is there or not
if it exists it shld generate the next number like "ON201"

i have a normal registeration page. and databse mysql.



Thank you

Try using something like this:

Code:

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mt_rand(1000,5000);

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PHP Code:

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function generateAccount ($length = 8)
{

  $account = "";
  $possible = "0123456789abcdfghjkmnpqrstvwxyz"; 
    
  $i = 0; 
    
  while ($i < $length) { 

    $char = substr($possible, mt_rand(0, strlen($possible)-1), 1);

    if (!strstr($account, $char)) { 
      $account .= $char;
      $i++;
    }
  }
  return $account;;
} 


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What's wrong with auto-increment in SQL? or are you not using a form of SQL?

If not, then you can just make a function that takes the last number from an array and adds 1 to it..

PHP Code:

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function next_increment($n)
{
    $i =  $n[count($n)];
     $i++;
     return $i;
}
$ID = Array (0,1,2,3,4,5,6,7);
$ID[] = next_increment($ID); //Add new ID.. 


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