PHP

PHP is sripting language for creating dynamic web pages and web applications.
It is executed by the web server. Result of execution of PHP scripts is HTML content served to a client.
It can be embedded into HTML code. It is often used in combination with a MySQL database.
PHP is the most popular scripting language for web servers. Interpreter for PHP is an open source project. The interpreter is written in C language.

Millions of online stores, blogs and other web sites are based on PHP.
To name just the few:
eCommerce: Magento, PrestaShop, Shopify and WooCommerce for eCommerce.
Content management systems (CMS): WordPress, Yoomla, Drupal

Some of the most popular programming frameworks:

  • Symfony 2
  • Zend
  • Laravel
  • Phalcon
  • Yii Framework
  • Codeigniter
  • CakePHP 3.0.

Some of the most popular templating systems:

  • Smarty
  • Twig
  • Volt
  • Blade
  • Mustache