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i am using a dropdown in php which asks for user_category before creating the user. Upon selection of the category further text boxes are to be created dynamically depending upon the selection. I know how to get the selected value from $_POST but here i need it befor form submission.Pls help
You cannot do that ONLY with PHP. PHP is a server-side language, so once you request the page and the PHP interpreter on the server interpreted it and served you the HTML, it does not know anything about what happens to the client. So PHP cannot know if the client changed selection.
What you can do is use JavaScript to do that.
You have 2 options:
1) have the text boxes values that you want to show hard-coded in Javascript for all the cases
2) query a PHP file asynchronously using AJAX so that it will return only the needed values.