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The Evolution of PHP: From Simple Scripts to Powerful Applications

PHP, created by Rasmus Lerdorf in 1994, has evolved significantly over the decades. Starting as a simple server-side script for traffic tracking, PHP introduced features like database support, file uploads, and more in subsequent versions. With the transformation brought by Zeev Suraski and Andi Gutman in PHP 3, and the introduction of the powerful Zend Engine in PHP 4, PHP embraced object-oriented programming and robust XML support in PHP 5. This open-source language's ease of use, cost benefits, and cross-platform compatibility make it a popular choice for web development.

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The Evolution of PHP: From Simple Scripts to Powerful Applications

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  1. PHP: Under The Hood Steven Taylor

  2. Evolution of PHP • PHP was created by RasmusLerdorf in 1994. It was initially server-side, traffic tracking script. • PHP 2 (1995) Added database support, file uploads, regular expressions, etc. • PHP 3 (1998) ZeevSuraskiand AndiGutmanstransform PHP and re-engineered the parser.

  3. PHP 4 (2000): The parser was dubbed the ZendEngine, and many security features were added. • PHP 5 (2004): • ZendEngine II, support for object oriented programming, robust XML support, Web Service interoperability, SQLite

  4. Why Use PHP • Easy to UseCode is embedded into HTML.The PHP code is enclosed in special start and end tags that allow you to jump into and out of "PHP mode". • <html>   <head>       <title>Example</title>   </head>   <body><?php       echo "Hi, I'm a PHP script!";        ?>   </body></html>

  5. Why Use PHP • 2. Cost BenefitsPHP is free. Open source code means that the entire PHP community will contribute towards bug fixes. There are several add-on libraries for PHP that are also free.

  6. Why Use PHP 3. Cross Platform Web Servers: Apache, Microsoft IIS, Caudium, Netscape Enterprise ServerOperating Systems: UNIX (HP-UX,OpenBSD,Solaris,Linux), Mac OSX, WindowsSupported Databases: Adabas D, dBase,Empress, FilePro (read-only), Hyperwave,IBM DB2, Informix, Ingres, InterBase, FrontBase, mSQL, Direct MS-SQL, MySQL, ODBC, Oracle (OCI7 and OCI8), Ovrimos, PostgreSQL, SQLite, Solid, Sybase, Velocis,Unixdbm

  7. Data Types

  8. Explicit Type Conversion settype() function $testString = “9.0”; settype($testString, “integer”); Casting $someData = 1; (String) $someData; (double)$someData; http://www.phpjunkyard.com/download.php?script=tcount

  9. Control Structures Conditional Iterative for() foreach() while() do…while • If…else…elseif • Switch

  10. Exception Handling • Exceptions handling is facilitated courtesy of the Exception • Class Example Exception Handling in PHP: function checkNum($number)  { if($number>1) { throw new Exception("Value must be 1 or below"); }return true;}try  {checkNum(2);}catch(Exception $e)  { echo 'Message: ' .$e->getMessage();}

  11. “PHP Manual”. http://www.php.net/manual/en/index.php (This is the site for the official manual of the PHP language) •  Peter L. Kantor . “Hudson Valley Community College Web Site” . http://www.daaq.net/old/php/index.php • Sebesta Robert W. Concepts OF Programming Languages . Tenth Edition . Boston:Pearson, 2010 • Wellington,LukeThomson,Laura. PHP and MySQL Web Development. Second Edition. Developers Library. USA. Sams Publishing. 2003 • Harris, Andy. PHP 5/MySQL Programming. for the absolute beginner. Canada. Premier • Gilmore, Jason. Beginning PHP and MySQL: From Novice to Professional. FourthEdition. Apress. 2010  • Habib, Irfan. “Integrating PHP and Perl”. Linux Journal. Volume 2007 Issue 154. Feb 2007 • Fioretti, Marco. “Top Ten Tips for Getting Started with PHP”. Linux Journal. Volume 2006 Issue 145. May 2006 • Knudsen, Craig. “PHP Version 4”. Linux Journal. Volume 1999 Issue 67es. November 1999 • http://pecl.php.net/package/operator Sources

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