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I've been looking to secure a site that has many queries involved. I've always known about mysql real escape string for a while but recently i ran across prepared statements. I had a few questions about them.

Is it a good idea to use both? is this over kill?

When should i use one but not the other?

Any other protection coding techniques i should look into for my queries and variables?

PDO prepared statements are better (IMO). You shouldn't need to mres() them, as PDO should be DB type agnostic (e.g. mysql, sqlite, odbc and sometimes mssql etc).

I think it's still a good idea to test the datatype or bounds for an input variable, before you proceed to run a query, e.g. if an input variable is expected to be an integer between 5 and 10 - check it before blindly using it in a query.

Are you using ORM?

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