You check `EXPLAIN` during code review and find no slow queries, yet in production, hundreds of SQL statements are being executed. This is the N+1 problem. Even if your index design is correct, ...

Since PHP 5.5.0, the mysql extension is deprecated I will be using PDO. So if you don't have PDO extension activated you can do it now. Or if could also use Mysqli instead. I have decided to use PDO ...

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