Obtaining the SoftwareThe first step is to make sure that you have all the software you need. Here is your shopping list: The most important item is, obviously, PHP itself. The PHP (version 4.1.0 or better) source code distribution is available from http://www.php.net/. If you intend to run PHP as an Apache module (recommended), you'll also need the Apache web server. Apache (version 1.3.20 or better) source code is available from http://www.apache.org/. In order to activate PHP's DOM and XSLT support, you also need a few external libraries: The zlib library (version 1.1.3 or better) is available from http://www.gzip.org/zlib/. The expat library (version 1.95.2 or better) is available from http://sourceforge.net/projects/expat/. The GNOME XML library, a.k.a. libxml (version 2.4.2 or better), is available from http://www.xmlsoft.org/. The Sablotron library (version 0.71 or better) is available from http://www.gingerall.com/. Many of the examples in this book assume that you have a MySQL database server up and running on your system. In case you don't, you will want to download and install it. MySQL (version 3.23.23 or better) is available from http://www.mysql.com/. Because you will be compiling all this software afresh, you also need a C++ compiler.Your development environment should already have one of these; however, in case it doesn't, you can try the GCC compiler. GCC is available at http://gcc.gnu.org/. Finally, you need the tar and gunzip utilities to decompress and extract files from their distribution archives. Binaries for both can be downloaded from the GNU web site at http://www.gnu.org/. In case you were wondering, all this software is freely available on the Internet, and can be downloaded at no charge.
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