php调用MsSQL存储过程使用内置RETVAL获取过程中的return值

$stmt = mssql_init('P__Global_Test', $conn) or die("initialize stored procedure failure");
	mssql_bind($stmt, "RETVAL", $returnValue, SQLINT4, true);
	mssql_execute($stmt, false);
        if( $returnValue == 0 ){
           echo 'ABCD';
        }
        else{ 
           echo 'EFGH';
 } 

CREATE PROCEDURE dbo.P__User_JudgeResume(
)
set nocount on

	set @Message = ''
	
	if not exists( select * from _Test )
	begin
		return 0
	end 
	else
	begin
		return 1
	end 

set nocount off
GO