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Logic to remove array items as a recommendation engine to show best solution


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I have users in my database with many stored points ie age, gender, interests etc. about 20 points in all.


I have a table of products that I want to recommend only applicable products. They each have saved like minage, maxage, gender, interest etc for the ideal consumer. ie dress gender=f


This is the bare bones of what I have so far:

$result = mysql_query("SELECT * FROM user_table WHERE hash='$session_id'");
$rowuser = mysql_fetch_array($result);

$result = mysql_query("SELECT * FROM products");
$rowproducts = mysql_fetch_array($result);

So now I have $rowuser['gender'] = m , how do I remove all from $rowproducts where gender = f?


Is there a best way to do this knowing I have about 20 points to go through before I am left with an array with just the best selection of products for this user in it?

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and what exactly prevents you from using the WHERE clause or doing a join? Unless your rules are so complex that they exceed the capabilities of MySQL, this is simply a matter of writing one query:

    -- something useful, not just "*"
    JOIN users
        products.gender = users.gender
        AND ...
    users.id = 1

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I have a person who is male, aged 30 and has kids.


I have a list of products with information like (product should only be shown to people with kids or product should only be shown to men aged 30 or older)


I have an array of the persons details and an array of all products with their details.


How do I remove the products from the array that do not match the users details. ie remove dresses when the user is a male.

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