[PHP] Using the OR operator in an IF statement

[Tim Burgan]

Hello,
Can someone please correct me on my efforts below.
If I have a condition where I want to test if a variable is not equal to 
"student", "staff", or "admin".. what's the simplest was to achieve that?

Here's what I tried.. that didn't work:
<?php
  if ( ($_POST['usertype'] != "student") || ($_POST['usertype'] != 
"staff") ||  ($_POST['usertype'] != "admin") )
  {
     // ...
  }
?>

And also:
<?php
  if ( ($_POST['usertype'] != "student" || "staff" || "admin" )
  {
     // ...
  }
?>
I must be using the OR operator the wrong way. Can someone please 
correct me on this.

Thanks very much for your time.
Regards
Tim Burgan
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