Problems with Substr().. plz help :(

[acidbox]

I have an ID number that I am store in a database. Let me use the following demonstration as an example of what is happening.

This is an example ID number that is stored in the database: 02080001-SV-01

I select it from the database as $id so for this example, $id = 02080001-SV-01

################################

$id_prefix = substr($id, 0, 4);

$old_id_num = substr($id, 4, 4);

$new_id_num = ($old_id_num + 1);

$id_suffix = substr($id, 8, 14);

$new_id = ($id_prefix . $new_id_num . $id_suffix);

################################

Now, if i print $new_id, it is supposed to say, 02080002-SV-01, but instead, it shows 02082-SV-01

Can anyone help me with this? I really dont know why substr is dropping the zeros off of my string. Thanks..

[hand]

<?
$id = "02000001-SV-01" ;

$id_prefix = substr($id, 0, 4); 
$old_id_num = substr($id, 4, 4);
$new_id_num = ($old_id_num + 1);

switch (strlen($new_id_num)) {
    case 1:
        $new_id_num = "000".$new_id_num;
		break;
    case 2:
		$new_id_num = "00".$new_id_num;
        break;
    case 3:
		$new_id_num = "0".$new_id_num;
        break;
}

$id_suffix = substr($id, 8, 14); 
$new_id = ($id_prefix . $new_id_num . $id_suffix); 

print $new_id;

[Phantazm]

Ok. Given the info you supplied, here's my test program.

<?php
  $id = "02080001-SV-01";
  $id_prefix = substr($id,0,4);
  $old_id_num = substr($id, 4, 4);
  $new_id_num = ($old_id_num +1);
  $id_suffix = substr($id, 8, 14);
  $new_id = ("$id_prefix$new_id_num$id_suffix");
  echo $new_id;  

?>

The problem is that "0001 + 1" doesn't equal "0002" in php, it is equal to simply "2".

There's probably a simpler solution that I'm overlooking, but the following will do the trick.

<?php
  $id = "02080001-SV-01";
  $id_prefix = substr($id,0,4);
  $old_id_num = substr($id, 4, 4);
  $new_id_num = ($old_id_num + 1);
  for ($x=strlen($new_id_num);  $x<4;  $x++)
  {
    $new_id_num = "0$new_id_num";
  }
  $id_suffix = substr($id, 8, 14);
  $new_id = ("$id_prefix$new_id_num$id_suffix");
  echo $new_id;  

?>

-= edit =-

Looks like hand beat me to the punch (while I was writing) 🙂 Both methods do the same thing

[acidbox]

I ended up using Phantazm's method, but I thank you both for your replies. It worked like a charm....

[hand]

This I call Evolution 😃

[Phantazm]

As you can see hand, in my example revolution is the key 😉

Phantazm