[PHP] problem with foreach

[Adam Williams]

I have an html page with checkboxes:

<form action=mailform2.php method=POST>
<input type=checkbox name=option[] value="Modern Mississippi">Modern 
Mississippi<br>
<input type=checkbox name=option[] value="Civil Rights">Civil Rights<br>
<input type=checkbox name=option[] value="Military 
History">MilitaryHistory<br>
<input type=submit name=submit value=Submit>
and mailform2.php containing:

echo "you selected: <br>";
/* line 81 */ foreach ($_POST[option] as $a)
       {
       echo "$a";
       }

but I'm getting the error:

you selected:

*Warning*: Invalid argument supplied for foreach() in 
*/var/www/sites/mdah-test/museum/mmhsurvey/mailform2.php* on line *81*

I googled some checkbox/foreach pages on google, but I don't see where 
I'm going wrong.  I'm running php 5.2.5 on Apache 2.2.4 on Fedora 
Linux.  Any help?

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