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Recursion can be slow, so we would rather not use a recursive function. We’d also like to minimize the number of database queries. Preferably, we’d have just one query for each activity. We’ll start by laying out our tree in a horizontal way. Start at the root node (‘Food’), and write a 1 to its left. We’ll call these numbers left and right (e.g. the left value of ‘Food’ is 1, the right value is 18). Before we continue, let’s see how these values look in our table: Note that the words ‘left’ and ‘right’ have a special meaning in SQL. Retrieve the Tree. Why is it better to develop in PHP with classes (OOP)? - PHP Classes blog. Introduction What are Object Oriented Programming Classes?
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