I meant that if you were to "sanitize" all input your program gets by replacing "'" by "\'" in there everywhere, then assuming that most of the rest of your pro

I meant that if you were to "sanitize" all input your program gets by replacing "'" by "\'" in there everywhere, then assuming that most of the rest of your program actually works as normal and calls libraries that do things correctly etc, you're just going to have backslashes show up because they're in the string. Maybe you also echo the string back to HTML immediately before it ever goes into SQL, et cetera. Only escaping quotes that are inserted directly into SQL query strings is not what I understood by "sanitizing all input".