You should be able to do this quite well with the str_pad() function.

http://us3.php.net/manual/en/function.str-pad.php

-M 

> -----Original Message-----
> From: Shaun [mailto:[EMAIL PROTECTED] 
> Sent: Sunday, February 13, 2005 12:09 PM
> To: php-general@lists.php.net
> Subject: [PHP] Ensure a number is three digits long
> 
> Hi,
> 
> I have am trying to create functions to convert strings to 
> ascii and vice
> versa:
> 
> function string_to_ascii( $str ) {
>  for( $i=0; $i < strlen( $str ); $i++ ) {
>    $asc .= ord( substr( $str, $i ) );
>   }
>  return $asc;
> }
> 
> This function works fine, however I need to ensure that the 
> ASCII convertions are three digits long so that I know where 
> to split the ASCII string when converting back to a normal 
> string. i.e. 97 must be 097.
> 
> Thanks for any advice offered 
> 
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