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Multiple Dropdown Selections

#1
[eluser]ShoeLace1291[/eluser]
I have a form that let's a user insert a page with the ability to select categories. I want them to have the ability to select multiple categories. I have a select drop down menu with the "multiple" attribute applied(<select name='category' multiple>).

My question is, how would I get the categories they selected and display them like below:
Quote:1, 2, 3, 4, 5

The numbers are the ids of the categories, which is the value of the selections, and will be located in one column of the table that the current record is being created in.

Another question...

These categories are fetched from a database table(categories). The table that these records are being inserted to(pages) with this form has a column called pageID and a column called CategoryID. What I want to do is to have a page for a specific category that will fetch a list of all the pages that are under this category.

Example: a page has categories of 1, 3, and 5. The user is viewing category 5. The category page should contain a list of content pages from category five.

How would I create a query that would do this?

#2
[eluser]ShoeLace1291[/eluser]
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