Missing check for field in $_COOKIE for PHP client

In RaygunClient::SetUser

You set two cookies, rguserid and rguuid, but you only verify that one exists before using the other.

Recommended changing "if (!arraykeyexists('rguuid', $COOKIE))" to "if (!arraykeyexists('rguuid', $COOKIE) || !arraykeyexists('rguserid', $_COOKIE))"

Diff provided. Upload seems broken, here's a link too http://tras.se/raygun.diff

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