Hi, I have a database table withe the next fields: category_id, parent_id, category_name.
How can i display all the categories with their subcategories, like this
Category 1 Category 11 Category 12 Category121 Category 2 Category 21 Category 22
You need to use a function that lists the children of the passed parent_id, then call it recursively so that it prints a tree. For the initial call, you would pass it the root id, usually 0 or -1.
There is a great Sitepoint article that details how to do this. Read http://www.sitepoint.com/article/hierarchical-data-database
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