PHP is a scripting language that is geared primarily for web development. It is one of the most used languages on the internet at large. PHP powers platforms like WordPress, Magento, Drupal, Joomla and other such applications.

PHP can run on its own by using PHP-FPM, or it can run as a module on a web server like Apache.

Applications that use PHP

• WordPress
• Joomla
• Drupal
• Magento 1.x/2.x
• SugarCRM
• SuiteCRM

Notable websites using PHP

• Facebook
• Wikipedia
• Tumblr
• Yahoo!
• MailChimp
• iStockPhoto

Further Reading

Wikipedia: https://en.wikipedia.org/wiki/PHP