What is PHP?

u"PHP Hypertext Preprocessor"

uScripting Server-Side language

uCreation of dynamic content – i.e. HTML and JSON

uInteraction with databases (CRUDs)

uServer side, or via command line (CLI)

uCan be embedded in HTML

uFirst introduced in 1995 as module for Apache

uOpen source, written in C

uSimilar to Perl and C

uPHP is "type-less" language.
uPHP originally stood for "PERSONAL HOME PAGE"

  uPHP runs on different platforms (Windows, Linux,                 Unix, etc.)‏    

  uPHP is compatible with almost all servers used today             (Apache, IIS, etc.)‏

  uPHP is easy to learn and runs efficiently on the server      side.

  uThe PHP code is enclosed in special start and end            processing instructions <?php and ?>  that allow you      to jump into and out of "PHP mode."