Hi ,

This will help you to generate a series of serial numbers till 100. I hope it helps you out.

for($i=0;$i<=100;$i++) {
echo sprintf("%05d", $i) . "<br>";
}

Thanks

As you mention you need a number which starts from 000 like but a integer variable always ignore the number starts from 0, so first thing you need to hold it as a string may be. Generating incremented number is not a big thing you can use database table or a static integer variable which will give you a number +1 to its previous value.

Now suppose you have a table handling the incremented integer value, which will give you 1 then 2 then 3 and so on whenever you call that function or you can create sequence in db.

int $numericId = getIdFromDB(); // this will give you previous id +1

Suppose you have 1 in variable $numericId. Now create a function getFiveDigitId( $numericId) which will return the string of five digit:

 function getFiveDigitId( $numericId){
  $id = $numericId/100000; // will give you 0.00001
  $strId = strVal($id); // convert to string 
  if(startsWith($strId, "0.")){
   return substr($strId, 1);
}else{
  return $numericId;
}
}