php

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.

PHP is the Web development language written by and for Web developers. PHP stands for PHP: Hypertext Preprocessor. The product was originally named Personal Home Page Tools, and many people still think that’s what the acronym stands for. But as it expanded in scope, a new and more appropriate (albeit GNU-ishly recursive) name was selected by community vote. PHP is currently in its fifth major rewrite, called PHP5 or just plain PHP. PHP is a server-side scripting language, which can be embedded in HTML or used as a standalone binary (although the former use is much more common). Proprietary products in this niche are Microsoft’s Active Server Pages, Macromedia’s ColdFusion, and Sun’s Java Server Pages. Some tech journalists used to call PHP “the open source ASP” because its functionality is similar to that of the Microsoft product—although this formulation was misleading, as PHP was developed before ASP. Over the past few years, however, PHP and server-side Java have gained momentum, while ASP has lost mindshare, so this comparison no longer seems appropriate. 

Download

PHP 5.4.16 (Current stable)

Complete Source Code

• PHP 5.4.16 (tar.bz2) [11,416Kb] - 06 Jun 2013
  md5: 3d2c694d28861d707b2622c3cc941cff
• PHP 5.4.16 (tar.gz) [14,447Kb] - 06 Jun 2013
  md5: 3940a5295872964495f9c56596272d68
• Windows 5.4.16 binaries and source
• Changelog for PHP 5.4.16

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PHP 5.3.26 (Old stable)

Complete Source Code

• PHP 5.3.26 (tar.bz2) [11,162Kb] - 06 Jun 2013
  md5: d71db8d92edbb48beb5b645b55471139
• PHP 5.3.26 (tar.gz) [14,649Kb] - 06 Jun 2013
  md5: a430a48b8939fe1f8915ee38681b0afa
• Windows 5.3.26 binaries and source
• Changelog for PHP 5.3.26

Note# The Above information is referred from php official site.