About PHP

History Of PHP

Paradigm(s) imperativeobject-oriented,proceduralreflective
Appeared in 1995; 18 years ago
Designed by Rasmus Lerdorf
Developer The PHP Group
Stable release 5.4.16 (June 6, 2013; 12 days ago)
Preview release 5.5.0RC3 (June 6, 2013; 12 days ago)
Typing discipline Dynamicweak
Major implementations Zend EnginePhalanger,QuercusProject Zero,HipHop
Influenced by PerlCC++JavaTcl
Implementation language C
OS Cross-platform
License PHP License
Usual filename extensions .php, .phtml, .php4 .php3, .php5, .phps

What is PHP?

  • PHP stands for PHP: Hypertext Preprocessor
  • PHP is a widely-used, open source scripting language
  • PHP scripts are executed on the server
  • PHP is free to download and use

What is a PHP File?

  • PHP files can contain text, HTML, JavaScript code, and PHP code
  • PHP code are executed on the server, and the result is returned to the browser as plain HTML
  • PHP files have a default file extension of “.php”

What Can PHP Do?

  • PHP can generate dynamic page content
  • PHP can create, open, read, write, and close files on the server
  • PHP can collect form data
  • PHP can send and receive cookies
  • PHP can add, delete, modify data in your database
  • PHP can restrict users to access some pages on your website
  • PHP can encrypt data
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