error reporting changed

junior/yinyang/index.php

@@ -3,9 +3,13 @@
 
 class YinYang
 {
-	
+
 	static function provera($a, $b)
 	{
+		if ($a > $b){
+			die("Please check input values, make sure that start and end values are correct.");
+		}else{
+	
 		while ($a <= $b) {
 			$mod3 = $a % 3 === 0;
 			$mod5 = $a % 5 === 0;
@@ -20,6 +24,7 @@ class YinYang
 				echo $a;
 			}
 			$a++;
+			}
 		}
 	}
 }