Test if 4 variables are equal

Hi all,

I'm just trying to figure out the best way to check if 4 variables are equal for error checking purposes.

I know I can test each of the combinations like this

if $var1 <> $var2 and $var1 <> $var3 and $var1 <> $var4 and $var2 <> $var3 and $var2 <> $var4 and $var3 <> $var4 then 

but I am curious how programmers would format it to be more efficient.

Thank you