Added support for PHP 8.1 (currently in RC1).
diff --git a/php/tests/GeneratedClassTest.php b/php/tests/GeneratedClassTest.php
index 2b15e42..837f052 100644
--- a/php/tests/GeneratedClassTest.php
+++ b/php/tests/GeneratedClassTest.php
@@ -565,7 +565,7 @@
         $m->setMapInt32Int32($dict);
         $this->assertSame(0, count($m->getMapInt32Int32()));
 
-        $dict = array(5 => 5, 6.1 => 6.1, "7" => "7");
+        $dict = array(5 => 5, 6 => 6.1, "7" => "7");
         $m->setMapInt32Int32($dict);
         $this->assertTrue($m->getMapInt32Int32() instanceof MapField);
         $this->assertSame(3, count($m->getMapInt32Int32()));