const google.golang.org/protobuf/internal/genid.FileOptions_PhpNamespace_field_fullname

one use

	google.golang.org/protobuf/internal/genid (current package)
		descriptor_gen.go#L452: 	FileOptions_PhpNamespace_field_fullname              protoreflect.FullName = "google.protobuf.FileOptions.php_namespace"