Fix version number in php macro (#7822)

Fixes #7812

php/ext/google/protobuf/message.c

diff --git a/php/ext/google/protobuf/message.c b/php/ext/google/protobuf/message.c
index 63d2b08..3db8663 100644
--- a/php/ext/google/protobuf/message.c
+++ b/php/ext/google/protobuf/message.c
@@ -265,14 +265,14 @@
   }
 
   upb_msg_set(intern->msg, f, msgval, arena);
-#if PHP_VERSION_ID < 704000
+#if PHP_VERSION_ID < 70400
   return;
 #else
   return val;
 #endif
 
 error:
-#if PHP_VERSION_ID < 704000
+#if PHP_VERSION_ID < 70400
   return;
 #else
   return &EG(error_zval);