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PHP: Under The Hood

PHP: Under The Hood. Steven Taylor. Evolution of PHP. PHP was created by Rasmus Lerdorf in 1994. It was initially server-side, traffic tracking script. PHP 2 (1995) Added database support, file uploads, regular expressions, etc.

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PHP: Under The Hood

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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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