Freeradius Max-Daily-Session in custom authentication

[Polarix]

Actually i have AAA by mysql and everything work fine. Especially the use
*Max-Daily-Session*attribute to disconnect the user after 10min (600sec)
connection. I recently changed the way authenticazione using a custom php
script. In sites-enabled/default file:

authorize{
update control {
    Auth-Type := `/usr/bin/php -f /etc/raddb/yourscript.php
'%{User-Name}' '%{User-Password}' '%{Client-IP-Address}'`}

In /etc/freeradius/users:

DEFAULT Auth-Type = AcceptExec-Program-Wait = "/usr/bin/php -f
/etc/raddb/attributes.php '%{User-Name}' '%{User-Password}'
'%{Client-IP-Address}'"

In attributes.php:

<?php
$User = $argv[1];
$Pass = $argv[2];
$Ip   = $argv[3];if ($User == "test")
    echo "Max-Daily-Session:=600";?>

It seems that the server does not care about the Max-Daily-Session
attribute and does not send the Packet of Disconnect. What changes between
mysql and custom authentication?