<?php
$number="14";
$number = sprintf("%05d",$number);
echo $number;
?>

<script language="JavaScript">
function add_zero(number) {
x = number.length;
 if (x < 6)
 {
  if (x == '1') { document.write ('0000'+number); }
  if (x == '2') { document.write ('000'+number); }
  if (x == '3') { document.write ('00'+number); }
  if (x == '4') { document.write ('0'+number); }
  if (x == '5') { document.write (number); }
 }else{
 document.write ('Le nombre ' +number+ ' a plus de 5 caractères !');
 }
}
</script>