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Navigating Directories Problem

This problem is part of the larger Creating a Picture Website project. It will allow navigation of a subdirectory tree so that the user can select a specific directory to work on.

For this problem, you are to cannibalize any available code and write a single script to navigate through the user's public_html directory tree.

Obviously, this will need to be a recursively called script. It will have to do the following.

1. Using popen(), determine the path to the user's public_html directory; use a process call to pwd to access the information.
2. Check the current directory path that was passed to the script; if it is empty(), set it to the full path to the user's public_html directory (e.g., /home/userid/public_html/).
3. If the directory path was typed into the URL and is out-of-bounds, terminate the script.
4. Determine the path of the current directory's parent directory.
5. Create a form with a Select Box to allow the directory navigation.
   • If the path to the user's public_html directory is the start of the parent directory, include an Option to it, showing ../ in the Select Box.
   • Using popen(), get a listing of the current directory.
   • If an item is a directory, show the name with a / appended to it and use the full path string as the value of the option.
   • If the item is a file, show the name and use the full path to the current directory as the value of the option (just in case the user chooses a file name).

Notes

• Use explode() and concatenation to work with the directory paths.
• Use print_r() to check on values generated by explode().