[PHP] Grab an array from a cookie without throwing errors?

[Brian Dunning]

I've got a cookie that's either non-existent or a serialized array. I'm 
trying all sorts of different code combinations to retrieve it into an 
array variable, but everything I try throws up some combination of 
notices and/or warnings. Here is my latest & greatest:

$cookie = $_COOKIE['bookmarks'];
if(unserialize($cookie) == true) {
        $bookmarks = unserialize($cookie);
} else {
        $bookmarks = array();
}
Produces:
Notice: Undefined index: bookmarks in 
c:\Inetpub\wwwroot\palms\htdocs\bookmarks.php on line 5

Notice: unserialize() [function.unserialize]: Argument is not an string 
in c:\Inetpub\wwwroot\palms\htdocs\bookmarks.php on line 5

Any suggestions on how I can do this without throwing notices? I'm 
aware that I can turn notices off but I like them kept on to help me 
with debugging.

- Brian
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