date - first day of week problem

Olá forum,

i have a problem whit to show the first date of week on form

i have creat a function to show this
function now2()

{

$dia_semana = strftime("%w");

$dia_hj = strftime("%d");

$mes = strftime("%m");

$ano = strftime("%Y");

$zero = 0;

$primeiro_dia = $dia_hj - $dia_semana;
echo "$zero$primeiro_dia/$mes/$ano";
return "$zero$primeiro_dia/$mes/$ano";

}
in echo its works and show correct date

ex: 05/03/2006
in return its show a blank.

my filed is a "date" format in postgresql and "Edit as" on phprunner as Date

what to show this echo on dafault value?
bad english i from brazil

=)