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Editing File Problem

This problem is part of the larger Creating a Picture Website project. It will get information from the grouplist.txt (if it already exists) and piclist.txt files and generate a page with all of the thumbnails serving as links to the original large pictures.

Your script should, in the end, do the following.

1. If the grouplist.txt file already exists, read the main title into a variable and the group names into an array. It is probably easiest for the end-user if you use subscripts starting with 1 instead of 0 so that they match with group numbers assigned to the pictures.
2. Set up a form which will call the createindex.php script when the "Submit" button is clicked.
   • Establish Text Boxes for the main title and the group names.
   • Pass the current directory and the server path as hidden values.
   • In each cell of a three-column table, display a thumbnail with its group number, item number and caption. When this script is run for the first time, the group number default value should be 0, consecutive values should be assigned for the item numbers and the captions should be NULL. When this script is run subsequently for editing, these values should be read from the piclist.txt file, using the explode() and list() functions to separate the information from each line.

     Use arrays for inputting the values for the group numbers (Text Boxes), item numbers (Text Boxes), and captions (TextArea) for the pictures. Pass the names of the full-size and thumbnail pictures as hidden array variables.

Notes

It is best to write initial code which uses hardset values for the directory paths for the current directory (which starts with /home/) and the server path (which starts with the name of the machine and ~userid). Once you have that working, you can get information from the $_SERVER[] array to assemble the URL for displaying the pictures along with the picture directory path below the public_html directory.

If an at-sign (@) is prepended to a function name, any warning message which would be generated will be suppressed. This is useful if you plan on dealing with the failure of the function yourself (as you should when grouplist.txt does not exist the first time around).