contact form question

[lialight]

Hello, I am relatively new to PHP I have a basic understanding though. I have a form to e-mail contact form....
It needs the user to fill in either their phone or the e-mail field. It doesn't need both, just one or the other. I need help forming the if statement for this situation.

if(empty($phone)) || (empty($email)) {
echo "<b>Please GO BACK and fill in either your email or phone\n";
$error = true;
}

but if the phone is empty and the email is filled in or vice versa, I want the form to be sent so I think I am missing some pieces. Can someone please help me?!?

[paul2463]

[code]
<?php
if((empty($phone)) && (empty($email)) // if both are empty
{
echo "Please GO BACK and fill in either your email or phone\n";
  $error = true;
}
>?
[/code]