PHP developers may need a local computer which can run PHP scripts before they can try them on a web hosting server. Then these softwares will help them establish a server environment right from their local PC. These can also help PHP newbies to learn PHP coding without the need of a hosting server.
If you are new to local server environments then this tutorial on How to install and setup Apache, MySQL and PHP in Windows will help you setup WAMP. Installing localhost server with other softwares are basically the same. And all of these alternatives for WAMP are free to download.
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EasyPHP installs a complete WAMP environment for PHP developers in Windows including PHP, Apache, MySQL, PhpMyAdmin, Xdebug and many others. All errors, warnings and notices including coding best practices and recommended coding standards in PHP are displayed.