Question: Use the techniques you learned in Chapter 6 to create a Guest Book script that stores visitor names and e-mail addresses in a text ?le.

Use the techniques you learned in Chapter 6 to create a Guest Book script that stores visitor names and e-mail addresses in a text ?le. Include functionality that allows users to view the guest book and prevents the same user name from being entered twice. Also, include code that sorts the guest book by name and deletes duplicate entries. in php

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