Add support for keys with multiple values

tests/verifyAgainstStubsTest.php

@@ -22,7 +22,7 @@ final class verifyAgainstStubsTest extends TestCase
         $files = array_diff(scandir(self::STUBS_DIRECTORY), array('.', '..'));
         foreach($files as $file) {
             $data = json_decode(file_get_contents(self::STUBS_DIRECTORY . "/" . $file), true);
-            $this->assertSame(pg4wp_rewrite($data['mysql']), $data['postgresql']);
+            $this->assertSame($data['postgresql'], pg4wp_rewrite($data['mysql']));
         }
     }