PHP / MYSQL将每行的每列乘以所选值

Question

I'm trying to make a multiplying system to give consumers results on the product that I think they would like. I am pretty new at PHP and MYSQL so if you can add little explanations that would be great! If not then I will figure it out!

So each product gets a rating from 1-3.
___________________________________________
Name | Softness | Warmth
Item 1 | 2 | 1
Item 2 | 3 | 3
Item 3 | ... | ...
... | ... | ...

On the product page it asks the consumer what they are looking for.

Softness [menu 1-3]
Warmth [menu 1-3]

I want the dropdown menu value to multiply with the column values in the mysql database.

Customer chooses softness: 1 and warmth: 2 Item 1 : 2, 2 Item 2: 3, 6 Item 3: etc Continues with all products

Then it would display the top 3 items with the highest values.

Question Page:

How important is softness in your product?
<input id="1" type="radio" name="softness" value="-1.0">
<label for="1">Not very important</label>
<input id="2" type="radio" name="softness" value="0" checked>
<label for="2">Neutral</label>
<input id="3" type="radio" name="soft" value="1.0">
<label for="3">Very important</label>

How important is warmth in your product?
<input id="1" type="radio" name="warmth " value="-1.0">
<label for="1">Not very important</label>
<input id="2" type="radio" name="warmth " value="0" checked>
<label for="2">Neutral</label>
<input id="3" type="radio" name="warmth " value="1.0">
<label for="3">Very important</label>

This is all I got so far...

    <?php

    // Connect SQL 
    include"database/sqlcon.php";

    // Select Database
    $query = mysql_query(
    "SELECT * FROM product LIMIT 3"
    );

    if(!$query) {
    die(mysql_error());
    }

    // Get Form Values
    $softness= $_POST['softness'];
    $warmth= $_POST['warmth'];

    while($row = mysql_fetch_array($query)) {
    $productname = $row['product'];
    $productsoft= $row['soft'];
    $productwarm = $row['warm'];

    }

    $totalsoft = $productsoft * $softness; 
     $totalwarm = $productwarm * $warmth;

    mysql_close();

    ?>

Answer 1

if it is a post, and you are using mysql PDO

if(isset($_POST))
{
   $items = $db->query("select * from items");
   $row_items = $items->fetch();
   $weight_values = array();
   $x= 0;

   do{
      $weight_values[$x]['1'] = $_POST['Softness']*$row_items['softness'];
      $weight_values[$x]['2'] = $_POST['Warmth']*$row_items['warmth'];
      $x++;
   }while($row_items = $items->fetch());

}

Then you can just echo out the values from the array. Basically you are accessing all the information from your items table, then you are going to go through it 1 by 1 in the while loop. For each row you are going to multiply the value in the database by the posted value, you are then going to put that value into an array.

You can then access that array by using

echo $weight_values[0][1]; //for item with id 1 softness value
echo $weight_values[0][2]; //for item with id 1 warmth value    

If you are using mysql which you shouldn't as given by the reason in the link

if(isset($_POST))
{
   $query_items("select * from items");
   $items = mysql_query($query_items,$items_db) or die(mysql_error());
   $row_items = mysql_fetch_assoc($items);
   $weight_values = array();
   $x= 0;

   do{
      $weight_values[$x]['1'] = $_POST['Softness']*$row_items['softness'];
      $weight_values[$x]['2'] = $_POST['Warmth']*$row_items['warmth'];
      $x++;
   }while($row_items = mysql_fetch_assoc($items));

} 

Answer 2

A pure Mysql Implementation considering that,

1. All the inputs are sanitized & escaped.
2. All other programing principles / factors / Good Practices are taken care of.

IMHO is as follows,

select
  *,
  softness * '. $softness .' + warmth * '. $warmth .' as totalindexy
from items2
order by totalindexy DESC
LIMIT 3 -- Then it would display the top 3 items with the highest values

and this method has a few benefits,

1. Less data travels between MySQL and php
2. You don't need to post-process it afterwards in php, since it already gives you the best three options.
3. If the table is huge as in no of rows, then this solution is better, as importing the whole table to php and sorting/filtering the top three may produce memory limit errors.

Update 1 :- Regarding the Syntax Error.

Here is a SQL Fiddle to prove/explain the working of my solution.

The customary warning :-

Please start using MySQLi instead of MySQL ASAP since not doing so shall put the security of your application at huge risk.