function phone($phone)
{
if( $phone=='' ) return true;
if(eregi('^(\(?[2-9]{1}[0-9]{2}\)?|[0-9]{3,3}[-. ]?)[ ]?[0-9]{3,3}[-. ]?[0-9]{4,4}$', $phone ))
return true;
else
return false;
}

function phone($phone)
{
list($number1,$number2,$number3)=split("-",$phone,3);
if($phone=='' || strlen($phone)!=10 || !(is_numeric($number1)) || !(is_numeric($number2)) || !(is_numeric($number3)) || strlen($number3)!=2) return false;
if(ereg('^([0-9]{4})-([0-9]{4})-([0-9]{3})$', $phone))
return false;
else
return true;
}