Mr. dot is evil is the first thing we taught new engineers at Facebook during the security engineering on boarding. There’s a whole slide deck (filled with rea

Mr. dot is evil is the first thing we taught new engineers at Facebook during the security engineering on boarding. There’s a whole slide deck (filled with real code snippets) with examples where a string was used instead of a better suited object representation and lead to a security flaw. We eventually build xhp/jsx to get rid of strings-holding-html data, but that was just scratching the surface of bugs caused by user-supplied strings.