Version Release date Main Features
1.0 8 June 1995 Officially called “Personal Home Page Tools (PHP Tools)”. This is the first use of the name “PHP”.
2.0 1 November 1997 Officially called “PHP/FI 2.0”. This is the first release that could actually be characterised as PHP, being a standalone language with many features that have endured to the present day.
3.0 6 June 1998 Development moves from one person to multiple developers. Zeev Suraski and Andi Gutmans rewrite the base for this version.
4.0 22 May 2000 Added more advanced two-stage parse/execute tag-parsing system called the Zend engine.
4.1 10 December 2001 Introduced ‘superglobals’ like:$_GET, $_POST, $_SESSION.
4.2 22 April 2002 Disabled register_globals by default. Data received over the network is not inserted directly into the global namespace anymore, closing possible security holes in applications.
4.3 27 December 2002 Introduced the Command Line Interface (CLI), to support the CGI.
4.4 11 July 2005 Fixed the memory corruption bug, which required breaking binary compatibility with extensions compiled against PHP version 4.3.x.
5.0 13 July 2004 Zend Engine II with a new object model.
5.1 24 November 2005 Performance improvements with introduction of compiler variables in re-engineered PHP Engine.
5.2 2 November 2006 Enabled the filter extension by default. Native
5.3 30 June 2009 Late static bindings, jump label (goto), closures, PHP archives (phar), garbage collection for circular references, improved Windows support, sqlite3, mysqlnd as a replacement for libmysql as underlying library for the extensions that work with MySQL, fileinfo as a replacement for mime_magic for better support, the Internationalization extension, and deprecation of ereg extension.
5.4 1 March 2012 Trait support, short array syntax support. Removed items:
session_unregister() and session_is_registered().
Built-in web server. Several improvements to existing features, performance and reduced memory requirements.
5.5 20 June 2013 Support for generators, finally blocks for exceptions handling, OpCache (based on Zend Optimizer+) bundled in official distribution.
5.6 28 August 2014 Constant scalar expressions,variadic functions, argument unpacking, new exponentiation operator, extensions of the use statement for functions and constants, new phpdbg debugger as a SAPI module, and other smaller improvements.
7.0 Mid October 2015 Zend Engine 3 (improved performance and 64-bit integer support for Windows), uniform variable syntax, AST-based compilation process, added Closure::call(), bitwise shift consistency across platforms,?? (null coalesce) operator, Unicode codepoint escape syntax,return type declarations and scalar type (integer, float, string and boolean) declarations

The Php Version 5.4, 5.5 and  5.6 can be download from here for the Linux…

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