动态下拉列表

Question

So I'm developing an e-commerce site using PHP. But how am I suppose to make the values of select tag dynamic? eg retrieving the records of 'category table' from database to a HTML select tag. And also how to use that select tag to store a new product.

Sample script

<select>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

All the values are static right? What I want to do is to make it dynamic by getting all the values from database by using PHP.

Answer 1

Your code should look like this:

<select>
<?php
    $res = mysql_query( "SELECT id, name FROM category_table" );
    while( $r = mysql_fetch_object( $res ) ) {
        echo '<option id="'.$r[ 'id' ].'">'.$r[ 'name' ].'</option>';
    }
?>
</select>

Answer 2

You are building your own e-commerce site, so probably you know how to select data from database, am I right? Filling up <select> with data from database is simillar to showing products list.
You only need to do some SELECT from database, fetch and iterate through output datas.

Your second question - how to use that select to store a new product - I am not sure how do you want to use select to save new data. Please provide some more information about it.