PHP7 Strategy

Behavioral/Strategy/DateComparator.php

@@ -5,17 +5,16 @@ namespace DesignPatterns\Behavioral\Strategy;
 class DateComparator implements ComparatorInterface
 {
     /**
-     * {@inheritdoc}
+     * @param mixed $a
+     * @param mixed $b
+     *
+     * @return int
      */
-    public function compare($a, $b)
+    public function compare($a, $b): int
     {
         $aDate = new \DateTime($a['date']);
         $bDate = new \DateTime($b['date']);
 
-        if ($aDate == $bDate) {
-            return 0;
-        }
-        
-        return $aDate < $bDate ? -1 : 1;
+        return $aDate <=> $bDate;
     }
 }