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Beginner's Guide

WHAT IS PHP
PHP is a web scripting language that allows you to enhance your website by adding logic, MySQL database connectivity or dynamic content. PHP-enabled web pages are treated just like regular HTML pages and you can create and edit them the same way you normally create regular HTML pages. We offer both PHP versions 3 and 4.

HOW DO PHP3 AND PHP4 CO-EXIST?
Each version of PHP requires the use of a different extension:

       PHP Version                  Extension
         
PHP3                       .php3 or .php
         PHP4                           .php4

USING PHP3
You must name your files with the .php3 or .php file extension. PHP3 scripts run as the user nobody, so if you want a script to write to a file, you need to create a directory with 777 permissions (drwxrwxrwx), and have the PHP script write to a file within that directory. You must have an Ecommerce or Max Plan to use PHP3 with a MySQL database, and PHP3 scripts will run over the SSL (secure server).

USING PHP4
PHP4 scripts run as the username of the account owner, so no special file permission settings need to be set. You must have an Ecommerce or Max Plan to use PHP4. PHP4 scripts will NOT run over the SSL (secure server). If you want to run a PHP4 script over the secure server, you will need to rename the file to have a .php3 extension, and make sure the script will work with PHP3 (i.e. have no PHP4 specific functions or commands).

USING PHP WITH MySQL
Make sure you use the mysql_close() function after you've opened a mysql database connection, and have performed your query. The mysql_close() function must be used in php scripts to ensure all database connections close properly. Failure to do so may result in script failure as all available database connections will be exhausted.

NOTE: Do not use the mysql_pconnect function to access your mysql database. There is a bug with PHP that will cause your php scripts to fail if you use the mysql_pconnect function. Please use mysql_connect instead.

Related Links
    Official Website
    Tutorial on converting ASP pages to PHP
    PHP Help Pages