[PHP-GTK-ORACLE] - Erreur TNS

I have a simple script in php :

putenv("ORACLE_HOME=D:\\ORANT");
putenv("TNS_ADMIN=D:\\ORANT\\NETWORK\\ADMIN");
putenv("ORACLE_SID=xxxxxxxxx");

echo "Oracle : ". getenv("ORACLE_HOME")." \n";
echo "TNS_ADMIN : ". getenv("TNS_ADMIN")." \n";
echo "ORACLE_SID  : ". getenv("ORACLE_SID")." \n";

$connect_oracle = ora_logon("xxxxx@xxxxxxx"   ,
                            "SERETI"        );

But then i do :
    e:\> php testoracle.php
the prog reply : ORA-12154 : TNS name not resolved

with apache server, I don't have this problem.
Can u help me ?