Merge branch '4.4' into 5.1

* 4.4:
  CS: Apply ternary_to_null_coalescing fixer

Author: derrabus

Collator/Collator.php

@@ -114,7 +114,7 @@ public function asort(array &$array, int $sortFlag = self::SORT_REGULAR)
             self::SORT_STRING => \SORT_STRING,
         ];
 
-        $plainSortFlag = isset($intlToPlainFlagMap[$sortFlag]) ? $intlToPlainFlagMap[$sortFlag] : self::SORT_REGULAR;
+        $plainSortFlag = $intlToPlainFlagMap[$sortFlag] ?? self::SORT_REGULAR;
 
         return asort($array, $plainSortFlag);
     }

DateFormatter/DateFormat/FullTransformer.php

@@ -298,15 +298,15 @@ private function calculateUnixTimestamp(\DateTime $dateTime, array $options)
     private function getDefaultValueForOptions(array $options): array
     {
         return [
-            'year' => isset($options['year']) ? $options['year'] : 1970,
-            'month' => isset($options['month']) ? $options['month'] : 1,
-            'day' => isset($options['day']) ? $options['day'] : 1,
-            'hour' => isset($options['hour']) ? $options['hour'] : 0,
-            'hourInstance' => isset($options['hourInstance']) ? $options['hourInstance'] : null,
-            'minute' => isset($options['minute']) ? $options['minute'] : 0,
-            'second' => isset($options['second']) ? $options['second'] : 0,
-            'marker' => isset($options['marker']) ? $options['marker'] : null,
-            'timezone' => isset($options['timezone']) ? $options['timezone'] : null,
+            'year' => $options['year'] ?? 1970,
+            'month' => $options['month'] ?? 1,
+            'day' => $options['day'] ?? 1,
+            'hour' => $options['hour'] ?? 0,
+            'hourInstance' => $options['hourInstance'] ?? null,
+            'minute' => $options['minute'] ?? 0,
+            'second' => $options['second'] ?? 0,
+            'marker' => $options['marker'] ?? null,
+            'timezone' => $options['timezone'] ?? null,
         ];
     }
 }

NumberFormatter/NumberFormatter.php

@@ -394,7 +394,7 @@ public function format($value, int $type = self::TYPE_DEFAULT)
      */
     public function getAttribute(int $attr)
     {
-        return isset($this->attributes[$attr]) ? $this->attributes[$attr] : null;
+        return $this->attributes[$attr] ?? null;
     }
 
     /**