Use ??= more

Author: nicolas-grekas

Languages.php

@@ -126,9 +126,7 @@ public static function alpha3CodeExists(string $language): bool
             return true;
         } catch (MissingResourceException) {
             static $cache;
-            if (null === $cache) {
-                $cache = array_flip(self::getAlpha3Codes());
-            }
+            $cache ??= array_flip(self::getAlpha3Codes());
 
             return isset($cache[$language]);
         }

Util/IntlTestHelper.php

@@ -32,9 +32,7 @@ class IntlTestHelper
      */
     public static function requireIntl(TestCase $testCase, string $minimumIcuVersion = null)
     {
-        if (null === $minimumIcuVersion) {
-            $minimumIcuVersion = Intl::getIcuStubVersion();
-        }
+        $minimumIcuVersion ??= Intl::getIcuStubVersion();
 
         // We only run tests if the version is *one specific version*.
         // This condition is satisfied if