Usually, when "smart" | "stupid" quotes appear in posted code, it's a sign that the poster is using some kind of word-processing editor. These editors try to "help" the user by quietly pairing up all their quotes into balanced pairs of "smart" quotes. If you're programming, do yourself a favor and use a programmer's editor. (Such editors use the Humpty-Dumpty theory of language: "When I use a word," Humpty Dumpty said, in rather a scornful tone, "it means just what I choose it to mean — neither more nor less." :)

Note: A good editor is often considered to be a part of a good IDE (Integrated Development Environment, or something like that). Maybe see this for some leads here.