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

one use

	google.golang.org/protobuf/internal/genid (current package)
		descriptor_gen.go#L453: 	FileOptions_PhpMetadataNamespace_field_fullname      protoreflect.FullName = "google.protobuf.FileOptions.php_metadata_namespace"