What is PHP Web Hosting?
PHP is a server-side (SSI), cross-platform (linux/unix), HTML embedded scripting language. PHP scripting codes are server-side meaning they execute on the website server, not within the user-browser on your computer. PHP is cross-platform, which means that PHP language can run on many types web servers and operating systems, primarily Windows/IIS and Unix/Apache or Linux/Apache. PHP snippets can be easily integrated into HTML scripting. It is a HTML Embedded Scripting Language, which means PHP statements / commands are actually placed within in your HTML documents. When the website server processes the PHP statements in the webpage, the server executes the language statements and sends the resulting output message along with the rest of the HTML script.

Do I need PHP Web Hosting?
If your web hosting service offers PHP you can create web contact forms, or webpages for interaction with visitors like forums. Like other server-side scripting languages, PHP is great for building dynamic web sites based on databases filled with content or different types and capabilities of Internet browsers. By using PHP's external libraries and functions, PHP web hosting can: create templates to ease website upkeep, Serve different website page content to users based on their browser type, IP address location, date and time, or numerous other characteristics, Build and gather online surveys, build discussion boards or forums and operate web-based e-mail programs - webmail, Connect to other database software like Postgres or MySQL to the Website, and process XML."

PHP Web Hosting Teams with MySQL Databases
PHP works really well with MySQL databases to give your visitors quick accessibility to your site. Because PHP is open-source and available with almost any PHP web hosting service (Windows or Unix), using PHP scripts and MySQL databases has become one of the most preferred methods for creating dynamically driven websites. Alternatives to PHP, such as ASP and Coldfusion, are usually limited to Windows hosting services, or cost extra per month as does Sun's Java Server Pages (JSP).

PHP Web Hosting Services: Hostmonster PHP Hosting | LunarPages PHP Web Hosting