Merge branch 'PHP-8.0'

* PHP-8.0:
  Revert "DateTime:: and DateTimeImmutable::getTimestamp() may return false"

Author: cmb69

ext/date/php_date.stub.php

@@ -232,7 +232,7 @@ public function setISODate(int $year, int $week, int $dayOfWeek = 1) {}
     public function setTimestamp(int $timestamp) {}
 
     /**
-     * @return int|false
+     * @return int
      * @alias date_timestamp_get
      */
     public function getTimestamp() {}
@@ -285,7 +285,7 @@ public function getTimezone() {}
     public function getOffset() {}
 
     /**
-     * @return int|false
+     * @return int
      * @alias date_timestamp_get
      */
     public function getTimestamp() {}

ext/date/php_date_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 1e51225485aa1a03fd2f58c9c85625b340de3d9d */
+ * Stub hash: 65e429036ef2ee45f31688bc2af94dc26a1b973a */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_strtotime, 0, 1, MAY_BE_LONG|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, datetime, IS_STRING, 0)