Set cookie by submit button

[RickyD77]

how can i set cookie by a submit button

i need it for a survey when the submit was click i execute a query and after that i want to set up the cookie

but the cookie need to be before anything else
how can i do that

Thx Eric

[fukas]

Important think is send cookie before you send any character of HTML code. Include space, tab, enter, etc.

<?  setcookie("foo",$HTTP_GET_VARS['foo']);
?>
<form action="<?=$PHP_SELF?>" method="get">
...
<input type="hidden" name="foo" value="foo">
...
</form>