1 / 31

www World Wide Web

www World Wide Web. Created in 1989 European Laboratory for Particle Physics ( Geneva Switzerland ) Purpose Provide an easy way to access cross-referenced documents that exist on the internet. The World Wide Web.

jaimie
Télécharger la présentation

www World Wide Web

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. www World Wide Web

  2. Created in 1989 • European Laboratory for Particle Physics (Geneva Switzerland) • Purpose • Provide an easy way to access cross-referenced documents that exist on the internet The World Wide Web Tim Berners-Lee followed his dream of a better, easier way to communicate via computers on a global scale, which led him to create the World Wide Web.

  3. Hypertext Markup Language (HTML) • Language used to design web pages (documents) • Web Browser • Program that displays HTML documents The historic NeXT

  4. Uniform Resource Locator (URL) • Consists of 4 parts: • Protocol  Hyper Text TransferProtocol (HTTP) • Domain Name  or Internet Protocol (IP) address • Directory • Filename • Specific document filename • index.(s)htm(l) or default.(s)htm(l) Sample URL: http://www.home.netscape.com/webmail/index.htm

  5. Versions of HTTP • Early protocol is HTTP 0.9 • read only • More recent versions: • HTTP 1.0 • read, input, delete, ... • HTTP 1.1 • performance optimizations

  6. WWW Ages : • Web1.0: static html sites (1990-2003) • Web2.0: dynamic web

  7. HTML Markup language

  8. What is an HTML File? • HTML stands for :Hypertext Markup Language • An HTML file is a text file containing small markup tags • The markup tags tell the Web browser how to display the page • An HTML file must have an htm or html file extension .html is preferred .htm extensions are used by servers on very old operating systems that can only handle “8+3” names (eight characters, dot, three characters) • An HTML file can be created using a simple text editor Formatted text, such as Microsoft Word’s .doc files, cannot be used in HTML files

  9. HTML Tags • HTML tags are used to mark up HTML elements • HTML tags are surrounded by angle brackets, < and > • Most HTML tags come in pairs, like <b>and </b> • The tags in a pair are the start tag and the end tag • The text between the start and end tags is the element content • The tags act as containers (they contain the element content), and should be properly nested • HTML tags are not case sensitive; <b>means the same as <B> • XHTML tags are case sensitive and must be lower case To ease the conversion from HTML to XHTML, it is better to use lowercase tags

  10. PHP Language

  11. PHP:HypertextPreprocessor What is PHP Language • Other Names : Personal Home Page • Professional Home Page • An embedded scripting language for HTML like ASP or JSP • A language that combines elements of Perl, C, and Java • Is a server side scripting language • HTML generates the web page with the static text and images

  12. Created by Rasmus Lerdorf in 1995 for tracking access to his resume • Originally a set of Perl scripts known as the “Personal Home Page” tools • Rewritten in C with database functionality • Added a forms interpreter and released as PHP/FI: includes Perl-like variables, and HTML embedded syntax History Of PHP

  13. Rewritten again in and released as version 2.0 in November of 1997 • Estimated user base in 1997 is several thousand users and 50,000 web sites served • Rewritten again in late 1997 by Andi Gutmans and • Zeev Suraski • More functionality added, database support, protocols and APIs History Of PHP (cont.)

  14. User base in 1998 estimated 10,000 users and 100,000 web sites installed • Version 3.0 was released in June 1998 as PHP • Estimated user base in tens of thousands and hundreds of thousands of web sites served • The core is rewritten in 1998 by Zeev and Andi and dubbed the “Zend Engine” History Of PHP (cont.)

  15. The engine is introduced in mid 1999 and is released with version 4.0 in May of 2000 • The estimated user base is hundreds of thousands of developers and several million of web sites served • Version 5.0 will include version 2.0 of the Zend Engine • New object model is more powerful and intuitive • Objects will no longer be passed by value; they now will be passed by reference • Increases performance and makes OOP more attractive History Of PHP (cont.)

  16. Netcraft Statistics • As of August 2004, PHP is used on 16,946,328 • Domains, 1,348,793 IP Addresses , This is roughly 32% of all domains on the web. History Of PHP (cont.)

  17. Example sites using PHP language : 1- www.yahoo.com/index.php 2- www.facebook.com/index.php 3- www.up.edu.ps/index.php

  18. 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>University of Palestine</title>   </head>   <body><?php        echo "Hi, Welcome to University of Palestine !";        ?>  </body></html> Why is PHP used?

  19. Cross PlatformRuns on almost any Web server on several operating systems.One of the strongest features is the wide range of supported databases • Web Servers:Apache, Microsoft IIS, Caudium, Netscape Enterprise Server • Operating Systems:UNIX (HP- UX, OpenBSD, Solaris, Linux), Mac OSX, • Windows NT/98/2000/XP/2003 • Supported 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,Unix dbm Why is PHP used?(cont.)

  20. Cost BenefitsPHP is free. Open source code means that the entire PHP community will contribute towards bug fixes. There are several add-on technologies (libraries) for PHP that are also free. Why is PHP used?(cont.)

  21. 4. primarily designed for web applications • 5. well optimized for the response times needed for web applications • 6. PHP Language is an open source Why is PHP used?(cont.)

  22. Three basic data types • Integer • Double • String • More data types • Array • Object • PHP is an untyped language • variables type can change on the fly. PHP Data Type

  23. ArabTeam Programmers : www.arabteam2000-forum.com/index.php • PHP Manual : http://docs.php.net/ • PHP Tutorial : http://academ.hvcc.edu/~kantopet/php/index.php • PHP Coder : http://www.phpide.de/ • Jedit : http://www.jedit.org/ • PHP's creator offers his thoughts on the PHP phenomenon, what has shaped and motivated the language, and where the PHP movement is heading http://www.oracle.com/technology/pub/articles/php_experts/rasmus_php.html • Hotscripts – A large number of PHP scripts can be found at: http://hotscripts.com/PHP/Scripts_and_Programs/index.html :Additional Resources & References

  24. Some of the new functions added in version 5: • Arrays:array_combine() - Creates an array by using one array for keys and another for its values • array_walk_recursive() - Apply a user function recursively to every member of an array • Date and Time Related: • idate() - Format a local time/date as integer • date_sunset() - Time of sunset for a given day and location • date_sunrise() - Time of sunrise for a given day and location • time_nanosleep() - Delay for a number of seconds and nano seconds • Strings: • str_split() - Convert a string to an array • strpbrk() - Search a string for any of a set of characters • substr_compare() - Binary safe optionally case insensitive comparison of two strings from an offset, up to length characters • Other: • php_check_syntax() - Check the syntax of the specified file • php_strip_whitespace() - Return source with stripped comments and whitespace :Additional Resources & References

  25. The end ……..

More Related