[PHP] Need help with some logic and how to do it in PHP

[Brent Clements]

I have the following problem.

I have 7 string values, if any number of them are the same, I need to ouput that 
value, if they are all different, I need to output a blank string "". How would I do 
this in php outside of writing a huge if/then statement? This is a variation of my 
"String compare of 7 text strings" question yesterday. All of the 7 string values are 
values in an array, ie  $strings = array($string1, $string2, $string3, $string4, 
$string5, $string6, $string7);

Thanks,
Brent