I have the following html form variables
MnuMonth, txtday, MnuYear, & hdnWeekNum

I am trying to do the following
$strDate=StrtoTime(mnumonth." ".txtday." ".mnuyear)

and then hdnWeekNum=Date($strdate,"x" to set hdnweeknum to the week number

It appears that any reference I make to mnumonth actually references the literal 'mnumonth'

How do I tell php to reference the actual html form field variable contents of mnumonth

thanks for any help

It would appear that your concatenation is wrong. Instead of:
$strDate=StrtoTime(mnumonth." ".txtday." ".mnuyear)

Try:

$strDate=StrtoTime($mnumonth . $txtday . $mnuyear)