[PHP] Ensure a number is three digits long

[Shaun]

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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