month calendar

In the "After record added" event you can popolate the child field based on the values of the master record. Check this article: http://xlinesoft.com/phprunner/docs/after_record_added.htm

noted and thanks
i know how to autopopulate data to another table but i do not know how by selecting month and year on master table to get the month days on child table .

i mean i need help how to get / produce the data not how to create the insert sql .
pls help
ok looking around i add that on before add
$values['number']=cal_days_in_month(CAL_GREGORIAN,$values['month'],$values['year']);

echo("There was $d days in October 2005");
// Place event code here.

// Use "Add Action" button to add code snippets.
return true;
where it returns the number of days per month
now i need if for example select on field month 12 and year 2012 , the number of days will be 31 to add a script to add these 31 days of december one by one in the child table

on format like:
1/12/2012

2/12/2012

...

..

..

.

.

.

.

..

.
ok now i found it and trying following script that is not working
global $conn;
if ($values['number']='28')

{

$strSQLInsert = "update 28 set month='".$values['month']."',year='".$values['year']."'";

db_exec($strSQLInsert,$conn);

}

if ($values['number']='31')

{

$strSQLInsert = "update 31 set month='".$values['month']."',year='".$values['year']."'";

db_exec($strSQLInsert,$conn);

}

return true

;
updates both tables 28 and 31
can someone help please