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PHP is a server-side scripting language. You can think of it as a plugin for your web server that enables it to do more than just send exact copies of the files that web browsers ask for. With PHP installed, your web server will be able to run little programs (called PHP scripts) that can do tasks like retrieve up-to-the-minute information from a database and use it to generate a web page on the fly before sending it to the browser that requested it. Much of this course will focus on writing PHP scripts to do exactly that. PHP is completely free to download and use.

Whether you have a small or a huge website, you know how much hassle and time it takes to upgrade your web site pages. The upgrade process becomes even more irritating when you make a change that needs to be upgraded on every page of your website; a good example of such a change is adding a button to the header or changing the copy right information in the footer of your website. In this tutorial I will show you how PHP comes to the rescue with only few lines of code. You can use this tutorial to be the basis to make your website easier to maintain and upgrade.

If you’re used to building web sites with HTML, CSS, and perhaps even a smattering of JavaScript, you’re probably used to uploading to another location the files that make up your site. Maybe this is a web hosting service that you’ve paid for; maybe it’s a free service provided by your Internet Service Provider (ISP); or maybe it’s a web server set up by the IT department of the company that you work for. In any case, once you copy your files to their destination, a software program called a web server is able to find and serve up copies of those files whenever they are requested by a web browser like Internet Explorer or Firefox. Common web server software programs you may have heard of include Apache and Internet Information Services (IIS).

For your PHP scripts to retrieve information from a database, you must first have a database. That’s where MySQL comes in. MySQL is a relational database management system, or RDBMS. We’ll discuss the exact role it plays and how it works later, but briefly it’s a software program that’s able to organize and manage many pieces of information efficiently while keeping track of how all of those pieces of information are related to each other. MySQL also makes that information really easy to access with server-side scripting languages like PHP. MySQL, like PHP, is completely free for most uses.