• JavaScript files contain file paths, just like HTML files. The paths can be broken when you use PHP to insert library files.

• You can fix the problem by creating a JavaScript variable in each file containing the path to the Web root. That variable is added to the JavaScript code in the library files.

• The JavaScript variable can have its value set by PHP.

Where are we?

Our first PHP task is an easy one, but one of the most important uses of PHP.

Most Web pages have regions, like this:

Figure 1. Web page regions

Different parts of a page are put into the regions:

Figure 2. Using the regions

All of the pages on a site usually have the same structure.

Learn: * What a site directory tree is. * How to put files where Webers expect them to be. * How to create a directory tree that supports reuse.