PHP
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A brief description how php works on web.
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PHP
- 1. Prepared by: Chandan Das B.Tech 5th Semester Dept of CSE CIT , KOKRAJHAR
- 2. INTRODUCTION • It is an interpreted, server-side scripting language. • Originally designed for web development. • Similar languages are Perl, ASP.NET, Ruby, JSP (Java Server Pages) • Embedded into HTML • Can use DB (MySQL, Oracle, Microsoft SQL, Postgre SQL)
- 3. PHP stands for?? Personal Home Page
- 5. HISTORY • Began in 1994 by Rasmus Lerdorf • Soon he named PHP/FI to build simple, dynamic web applications. • In 1995 -the release of PHP/FI as "Personal Home Page Tools (PHP Tools) version 1.0". • In 1997 Zeev Suraski and Andi Gutmans rewrote the parser and formed the base of PHP 3, changing the name PHP: Hypertext Preprocessor. • On May,2000, PHP 4 was released, • On July , 2004, PHP 5 was released, powered by the new Zend Engine II. • In 2008 PHP 5 became the only stable version under development. • Finally after a vote the current version released in 2014 .
- 7. SCRIPTING LANGUAGE • A scripting language is: – cross-platform since interpreter is easy to port – implicit variable declaration – compiled on demand – Extending – Glue programming
- 17. BASIC PHP SYNTAX <?php ?>
- 18. VARIABLES IN PHP • All variables in PHP start with a $ sign symbol. • Variables may contain strings, numbers, or arrays. <html> <body> <?php $txt="Hello World"; echo $txt; ?> </body> </html>
- 19. DATA TYPES • String $name=“x” – 'My name is x.' – "My name is $name." • Boolean • Integer • Floating point • Array – $a=array("tokyo", "hanoi", "london") – $a=array("japan" => "tokyo", "vietnam" => "hanoi", "england" => "london") – $a[2] – $a["vietnam"]
- 20. STRING HANDLING • String literals (constants) enclosed in double quotes “ ” or single quotes ‘ ’ • Within “”, variables are replaced by their value: – called variable interpolation. “My name is $name, I think” • Strings are concatenated (joined end to end) with the dot operator “key”.”board” == “keyboard”
- 21. THE IF...ELSE STATEMENT Syntax if (condition) code to be executed if condition is true; else code to be executed if condition is false;
- 22. Syntax switch (expression) { case label1: code to be executed if expression = label1; break; case label2: code to be executed if expression = label2; break; default: code to be executed if expression is different from both label1 and label2; } THE SWITCH STATEMENT
- 23. PHP FUNCTION • Strlen(); • Strcmp(); • Date(); • Time(); • Include(); • Require();
- 24. STATE MANAGEMENT • It is used to help web applications to maintain their state across several HTTP requests when needed. • Cookies • Session
- 25. SESSION • Better option of cookie • Store information about a user. They are available only for a particular application and hold information of only one single user.
- 27. <?php start_session(); $_SESSION[‘user_name’]=‘’ $_SESSION[‘pwd’]=‘’ ?> //create a session
- 29. select username,password From table Where username=‘textbox1’ and password=‘textbox2’
- 31. <?php start_session(); $_SESSION[‘user_name’]= $_SESSION[‘pwd’]= if(isset($_SESSION[‘username’])) Echo “Welcome”. $_SESSION[‘name’] ?> //retrieve a session
- 32. • session_destroy(); • unset(); <?php start_session(); $_SESSION[‘user_name’]= if(isset($_POST[“lgt_btn"])) unset($_SESSION[‘user_name’]); ?> Name of the Logout button
- 34. FEATURES OF PHP – 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. – Supported on Windows, Mac OS X, other Unix-like systems (e.g. Linux). – Similar syntax and features as C++ and Java. – PHP designer,Wampp/Xampp are free of cost.
- 35. REFERENCES • Wikipedia • Google images • www.w3schools.com
- 36. THANK YOU