Simplify some code with null coalesce operator

Author: javiereguiluz

DateFormatter/IntlDateFormatter.php

@@ -142,8 +142,8 @@ public function __construct(?string $locale, ?int $datetype, ?int $timetype, $ti
             throw new MethodArgumentValueNotImplementedException(__METHOD__, 'calendar', $calendar, 'Only the GREGORIAN calendar is supported');
         }
 
-        $this->datetype = null !== $datetype ? $datetype : self::FULL;
-        $this->timetype = null !== $timetype ? $timetype : self::FULL;
+        $this->datetype = $datetype ?? self::FULL;
+        $this->timetype = $timetype ?? self::FULL;
 
         if ('' === ($pattern ?? '')) {
             $pattern = $this->getDefaultPattern();

Tests/DateFormatter/AbstractIntlDateFormatterTest.php

@@ -933,7 +933,7 @@ protected function getDefaultDateFormatter($pattern = null)
     protected function getDateTime($timestamp, $timeZone)
     {
         $dateTime = new \DateTime();
-        $dateTime->setTimestamp(null === $timestamp ? time() : $timestamp);
+        $dateTime->setTimestamp($timestamp ?? time());
         $dateTime->setTimezone(new \DateTimeZone($timeZone ?: getenv('TZ') ?: 'UTC'));
 
         return $dateTime;

Util/GitRepository.php

@@ -95,7 +95,7 @@ private static function exec(string $command, string $customErrorMessage = null)
         exec(sprintf('%s 2>&1', $command), $output, $result);
 
         if (0 !== $result) {
-            throw new RuntimeException(null !== $customErrorMessage ? $customErrorMessage : sprintf('The "%s" command failed.', $command));
+            throw new RuntimeException($customErrorMessage ?? sprintf('The "%s" command failed.', $command));
         }
 
         return $output;