如何在此if語句中添加「OR」運算符？

Question

我有這個IF語句，我想添加一個OR，所以它應該是如果（$變量1 == $變量2）或如果（$變量3 == $變量4）。

if($variable1 == $variable2) 
die(""); 

else 
echo(""); 

Answer 1

見PHP Logical Operators

if($variable1 ==$variable2 || $variable3 == $variable4) { 
//do whatever 
} 

Answer 2

if($variable1 == $variable2 || $variable3 == $variable4){ 
die(""); 
} 
else{ 
echo("");} 

Answer 3

if($variable1 == $variable2 || $variable3 == $variable4) 
die(""); 
else 
echo("");