Header errors

[drummel]

I am using these two for each loops for two sets of check boxes

foreach ($Module as $Mods) {
$Modtext.=$Mods . " ";
}

foreach ($RTP as $RTPPos) {
$RTPJob.=$$RTPPos . " ";
}

Both of these loops work, but I receive this error regarding header errors

Warning: Invalid argument supplied for foreach() in /usr/home/dave/www/formmailer.php on line 6

Warning: Invalid argument supplied for foreach() in /usr/home/dave/www/formmailer.php on line 10

Warning: Cannot add header information - headers already sent by (output started at /usr/home/dave/www/formmailer.php:6) in /usr/home/dave/www/formmailer.php on line 96

How do I tell the PHP that these foreach loops are not headers? I cheated by putting this

header("Location: Thanks.html");

which is usually on the bottom on the first line just to get my checkboxes working. Unfortunately that kills my error checking. Any ideas ? Thanks in advance.

[trooper]

The last error message is as a result of the first two messages being output to the screen

You need to look at what is causing the first two errors

Sounds like $RTP and $Module are not actual arrays - check yer code

HTH

GM