PHP 101 An Introduction to PHP 5
Rob Richards
http://xri.net/=rob.richards www.cdatazone.org
What Is PHP
Loosely typed
Variables can be of any type Variables set by context Functions can return different types
Dynamic Language
Dynamic typing Run time code modification Interpretation vs compilation
C# .NET Example
XmlDocument doc = new XmlDocument(); XmlElement root = doc.CreateElement("root"); doc.AppendChild(root); XmlElement child = doc.CreateElement("child"); root.AppendChild(child); XmlText textnode = doc.CreateTextNode("childcontent"); child.AppendChild(textnode); Console.Write(doc.OuterXml);
PHP Example
$doc = new DOMDocument(); $root = $doc->CreateElement("root"); $doc->AppendChild($root); $child = $doc->CreateElement("child"); $root->AppendChild($child); $root = $doc->CreateTextNode("childcontent"); $child->AppendChild($root); echo $doc->saveXML();
What Is PHP
Cross Platform Supports numerous types of Web servers Typically run on Web server Also used for command line scripting (CLI) Supports development of cross platform GUI applications (PHP-GTK)
History of PHP
1994 Personal Home Page Created by Rasmus Lerdorf Track Online Resume
History of PHP
1995 PHP/FI version 2 Personal Home Page / Forms Interpreter Growing needs of web pages mSQL support Open Source
History of PHP
1997 PHP 3 PHP: Hypertext Preprocessor Parser re-written by Andi Gutmans and Zeev Suraski needed more for an e-commerce application language was extendable
History of PHP
1999/2000 PHP 4 Core re-write Powered by Zend Engine 1.0 Handle more complex applications Improve modularity of PHP core Support for numerous databases and web servers
History of PHP
2004 PHP 5 Zend Engine 2 New Object Model Better XML and Web service support Better database support Other miscellaneous changes
The Future of PHP
PHP 5.3 (Early 2008)
Namespaces

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