nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Zend Server, the Professional PHP Distribution with Advanced Value-add Capabilities
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.
Zend Debug is a component that help the debugging of PHP applications. In particular it offers a static method Zend\Debug\Debug:dump() that prints or returns information about an expression. This simple technique of debugging is common because it is easy to use in an ad hoc fashion and requires no initialization, special tools, ...