for,foreach or while?

[sabret00the]

ok to understand this script, you need to know that $grps_showgroup is predefined at an earlier part of the script

the form that sends the data to the scipt is

			<form action="invitation.php" method="post">
				<table>
					<tr>
						<td valign="top">
							<fieldset>
								<legend>Users To Invite</legend>
								Username: <input name="invite_username[]" type="text" size="25" maxlength="250"><br />
								<br />
								Username: <input name="invite_username[]" type="text" size="25" maxlength="250"><br />
								<br />
								Username: <input name="invite_username[]" type="text" size="25" maxlength="250"><br />
								<br />
								Username: <input name="invite_username[]" type="text" size="25" maxlength="250"><br />
								<br />
								Username: <input name="invite_username[]" type="text" size="25" maxlength="250"><br />
							</fieldset>
						</td>
						<td valign="top">
							<fieldset>
								<legend>Personal Message To Be Included</legend>
									<textarea name="personal_message" cols="50" rows="9" id="personal_message">Please Enter A Personal Message The Group Description and Group Title Will Be Automatically Included.</textarea>
							</fieldset>
						</td>
					</tr>
				</table>
				<br />
				<input name="submit" type="button" value="Send Invite(s)">
				<input type="hidden" name="do" value="doinvite" />
			</form>

and this is the process engine

PHP Code:

if ($do == "doinvite")
{
    globalize($_POST, array('invite_username' => STR, personal_message => INT));

    if ($personal_message)
    {
        $og_personal_message = "Please Enter A Personal Message The Group Description and Group Title Will Be Automatically Included.";
        if ((strstr($personal_message, $og_personal_message)) AND (strlen($personal_message) == strlen($og_personal_message))
        {
            $include_message = TRUE;
        }
    }

    foreach ($invite_username AS $invite_id => $username)
    {
        if ($username == "")
        { // no point in checking the permission if they dont want to do anything to the confession
            //eval(print_standard_error('invalid_username'));
            // do nothing
        }
        else
        {
            $message = "$bbuserinfo[username] feels that you may be interested in joining one of the $vboptions[hometitle] Groups, this one in particular [url=$vboptions[homeurl]/groups/groups.php?$session[sessionurl]g=$groupid]$grps_showgroup[title]" . "[/url]" . if ($include_message) {"\n\nThey also included this message:\n=========================\n\n$personal_message" . ;} . "\n\n=========================\n\n Please take a look at the group, review it and then join.\n\nIf you'd like to just join straight away, please click this link [url=$vboptions[homeurl]/groups/membership.php?$session[sessionurl]g=$groupid]JOIN NOW" . "[/url]";
            $user['userid'] = //need to get the userid somehow?;
            $user['username'] = $username;
            $sendto["$username"] = true;
            $tostring["$user[userid]"] = $user['username'];
            $newpmtitle = "You've Been Invited To Join " . $grps_membership['title'];

        
            $DB_site->query("
                INSERT INTO " . TABLE_PREFIX . "pmtext(fromuserid, fromusername, title, message, touserarray, iconid, dateline, showsignature)
                VALUES($bbuserinfo[userid], '" . addslashes($bbuserinfo['username']) . "', '" . addslashes($newpmtitle) . "', '".addslashes($message)."', '" . addslashes(serialize($tostring)) . "', 0, '" . TIMENOW . "', 1)
            "); 

            $pmtextid = $DB_site->insert_id(); 

            $DB_site->query("
                INSERT INTO " . TABLE_PREFIX . "pm (pmtextid, userid, messageread)
                VALUES ($pmtextid, $user[userid], 0)
            "); 

            $DB_site->shutdown_query("
                UPDATE " . TABLE_PREFIX . "user SET pmtotal=pmtotal+1, pmunread=pmunread+1 WHERE userid = user[userid]
            "); 
        }
    }
} 


am i doing this all wrong? and how would i go about getting the userid? as this seems to be evading me especially as i'm getting the usernames as part of the loop.