Introduction to php
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Introduction to php

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Introduction to php Introduction to php Presentation Transcript

  • Presentation to Siltek Software Solutions (I) Pvt. Ltd.
  • What is it?  PHP is a scripting language commonly used on web servers.  Stands for “PHP: Hypertext Preprocessor”  Open source  Embedded code  Comparable with ASP  Multiple operating systems/web servers
  • More About PHP  PHP is free software released under the PHP License.  PHP typically runs on a web server that takes PHP as input and gives out HTML pages as output.  PHP is installed on more than 20 million websites and 1 million web servers.  PHP has a syntax similar to C and Java.  The current version of PHP is 5.2.x. View slide
  • What can it do?  Dynamic generation of web-page content  Database interaction  Processing of user supplied data  Email  File handling  Text processing  Network interaction  And more… View slide
  • Brief History of PHP  PHP (PHP: Hypertext Preprocessor) was created by Rasmus Lerdorf in 1994. It was initially developed for HTTP usage logging and server-side form generation in Unix.  PHP 2 (1995) transformed the language into a Server-side embedded scripting language. Added database support, file uploads, variables, arrays, recursive functions, conditionals, iteration, regular expressions, etc.  PHP 3 (1998) added support for ODBC data sources, multiple platform support, email protocols (SNMP,IMAP), and new parser written by Zeev Suraski and Andi Gutmans .
  • Brief History of PHP  PHP 4 (2000) became an independent component of the web server for added efficiency. The parser was renamed the Zend Engine. Many security features were added.  PHP 5 (2004) adds Zend Engine II with object oriented programming, robust XML support using the libxml2 library, SOAP extension for interoperability with Web Services, SQLite has been bundled with PHP  As of August 2004, PHP is used on 16,946,328 Domains, 1,348,793 IP Addresses http://www.php.net/usage.php This is roughly 32% of all domains on the web.
  • Fundamentals  PHP is embedded within xhtml pages within the tags: <?php … ?>  The short version of these tags can also be used: <? … ?>  Each line of PHP is terminated, like MySQL, with a semi-colon.
  • Hello World! <html> <head> <title>PHP Test</title> </head> <body> <?php echo ‘<p>Hello World!</p>’; ?> </body> </html>
  • Features of PHP  Performance  Relatively fast for an interpreted language.  Database Connectivity  Support for MySQL, Oracle, dbm, DB2, PostgreSQL  Can connect to any database which provides an ODBC driver (Open Database Connectivity Standard) – e.g. MS Access.
  • Features of PHP  Existing Libraries  PHP was originally designed for web use – lots of functions for common web-development tasks (e.g. Sending email, XML parsing, etc.)  Portability  Supported on Windows, Mac OS X, other Unix-like systems (e.g. Linux).
  • Features of PHP  Object-Oriented Programming  Similar syntax and features as C++ and Java – inheritance, attribute visibility (private, protected), abstract classes/methods, constructors and destructors, etc.  Popularity  As a result, lots of documentation, books, and web tutorials.
  • PHP Usage  Server-Side Scripting Language  Must have a web server and the PHP interpreter installed.  PHP interpreter processes pages before they are served to clients.
  • PHP Usage
  • Accessing MySQL Using PHP
  • About MySQL  GNU Free, open-source, multi-platform  Implements the standard SQL language  Relational DBMS  Written in C and C++  Uses MyISAM B-tree disk tables  Uses in-memory hash tables for temporary tables
  • Building On MySQL  What languages can we use for building an application on MySQL?  ODBC Connector  JDBC Connector  .NET Connector  Web scripting languages  PHP, ASP, JSP
  • Uses of PHP and MySQL  Anything in a MySQL database can be viewed on a webpage  Any information which can be captured from a website can be stored into a database
  • Connecting to MySQL from PHP /* Connection */ $username = ‘user’; // username $password = ’password'; // password $webhost = 'localhost'; // host (localhost or something on a web server) $db = ’test'; // the database $dbc = mysql_connect($webhost, $username, $password) or die("<p>Could not connect: <i>" . mysql_error()); @mysql_select_db($db) or die("<p>Could not find database - $db - <i>" . mysql_error() . "</i>");
  • MySQL is Built Into PHP  There are function calls to connect to a MySQL server, send SQL commands, and retrieve data from the server
  • Application Structure
  • Lets Install
  • XAMPP – What’s the tool? XAMPP (pronounced as ZAMP) is a small and light Apache distribution containing the most common web development technologies in a single package. Acronym for: X- Read as "cross", meaning cross-platform) A-Apache HTTP Server M-MySQL P-PHP P-Perl
  • Features of XAMPP • Ideal tool for developing and testing applications in PHP & MySQL. • Takes less time than installing each of its components separately. • Multiple instances of XAMPP can exist on a single computer. • Allow website designers and programmers to test their work on their own computers without any access to the Internet • XAMPP also provides support for creating and manipulating databases in MySQL and SQLite among others.
  • How to install ?  Go to http://www.apachefriends.org/en/xampp.html  Versions available for Linux, Windows, Solaris, Mac OS X
  • Steps for Installation  http://wiki.fiforms.org/index.php/Installing_XAMPP
  • Types of XAMPP  WAMP - Windows  MAMP – Mac OS X  SAMP - Solaris  LAMP - LINUX
  • XAMPP Configuration Starting : • To start XAMPP simply call this command : • You should now see something like this on your screen : • If you get any error messages please take a look at the Linux FAQ. /opt/lampp/lampp start Starting XAMPP 1.7.4... LAMPP: Starting Apache... LAMPP: Starting MySQL... LAMPP started.
  • XAMPP Configuration Stopping : • To stop XAMPP simply call this command : • You should now see something like this on your screen : • XAMPP for Linux is now stopped. Starting XAMPP 1.7.4... LAMPP: Stopping Apache... LAMPP: Stopping MySQL... LAMPP stoped. /opt/lampp/lampp stop
  • Recommended Texts for Learning PHP  Larry Ullman’s books from the Visual Quickpro series  PHP & MySQL for Dummies  Beginning PHP 5 and MySQL: From Novice to Professional by W. Jason Gilmore  (This is more advanced and dense than the others, but great to read once you’ve finished the easier books. One of the best definition/description of object oriented programming I’ve read)
  • Resources  Apache  Website: http://httpd.apache.org/  Documentation: http://httpd.apache.org/docs/2.2/  PHP  Website: http://www.php.net/  Documentation and language reference: http://www.php.net/docs.php  http://www.w3schools.com/php/default.asp
  • Resources  Xampp  Combines an Apache web server, PHP, and MySQL into one simple installation service.  Very little configuration required by the user to get an initial system up and running.  http://www.apachefriends.org/en/xampp.html