Programming PHP

Example 8-4. Backend administration page (continued)
When the administrator submits a new category, we construct a query to add the
category to the database. Another query displays the table of all current categories.
Figure 8-4 shows the page with five records loaded.
Figure 8-4. The administration page
Adding a Business
Example 8-5 shows the page that lets a business insert data into the business and
biz_categories tables. Figure 8-5 shows the form.
When the user enters data and clicks on the Add Business button, the script calls
itself to display a confirmation page. Figure 8-6 shows a confirmation page for a
company listing assigned to two categories.
In the confirmation page, the Add Business button is replaced by a link that will
invoke a fresh instance of the script. A success message is displayed at the top of
the page. Instructions for using the scrolling pick list are replaced with explanatory
text.
As shown in Example 8-5, we build the scrolling list from a query to select all the categories.
As we produce HTML for each of the results from that query, we also check
to see whether the current category was one of the categories submitted for the new
business. If it was, we add a new record to the biz_categories table.
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