[validator] improvement: use null coalescing operator

Author: connorhu

lib/validator/sfValidatorDate.class.php

@@ -189,9 +189,9 @@ protected function convertDateArrayToString($value)
                 (int) $value['year'],
                 (int) $value['month'],
                 (int) $value['day'],
-                isset($value['hour']) ? (int) $value['hour'] : 0,
-                isset($value['minute']) ? (int) $value['minute'] : 0,
-                isset($value['second']) ? (int) $value['second'] : 0
+                (int) $value['hour'] ?? 0,
+                (int) $value['minute'] ?? 0,
+                (int) $value['second'] ?? 0,
             );
         } else {
             $clean = sprintf(

lib/validator/sfValidatorTime.class.php

@@ -96,9 +96,9 @@ protected function convertTimeArrayToTimestamp($value)
         }
 
         $clean = mktime(
-            isset($value['hour']) ? (int) $value['hour'] : 0,
-            isset($value['minute']) ? (int) $value['minute'] : 0,
-            isset($value['second']) ? (int) $value['second'] : 0
+            (int) $value['hour'] ?? 0,
+            (int) $value['minute'] ?? 0,
+            (int) $value['second'] ?? 0,
         );
 
         if (false === $clean) {