Problem with $HTTP_POST_VARS

I'm trying to use $HTTP_POST_VARS but it have not value.
I found a configuration line in php.ini 
track_vars = On

but it didn't function.

The code:

echo "Valores enviados con el método POST: $step<br>";
 reset ($HTTP_POST_VARS);
 while (list ($clave, $val) = each ($HTTP_POST_VARS)) 
   { echo "$clave => $val<br>"; };

Show somting like that:

Valores enviados con el método POST: 

Any idea?

Thanks.

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