Format Phone Numbers (Addition to string helper)

[eluser]Iverson[/eluser]
In case anybody needs this...(US Phone Numbers)

Code:

function phone_format($str)
{
   // Keep only be digits
   $strPhone = ereg_replace("[^0-9]",'', $str);
   if(strlen($strPhone) != 10)
   {
      return $strPhone;
   }

   $strArea = substr($strPhone, 0, 3);
   $strPrefix = substr($strPhone, 3, 3);
   $strNumber = substr($strPhone, 6, 4);

   $strPhone = '(' . $strArea . ') ' . $strPrefix . '-' . $strNumber;

   return $strPhone;
}