Introduction to  PHP

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2.Server & Client Client: Your computerServer: Powerful &Expensive computer.Requires networkaccess

3.Static vs DynamicStatic DynamicShow case web sitesThe client asks the server for a web pageThe server answers back by sending the web pageStatic web pages are made by (X)HTML & CSS Most of web sites we use nowadaysThe client asks the server for a web pageThe server creates the page specially for the clientThe server sends the page that has been generatedDynamic web pages are made by (X)HTML, CSSPHP and MySQL

4.How PHP Works 1 4265 536 5 1. User request2. The request goes to webserver3. The request goes to PHPinterpreter4. The request is interpretedby PHP interpreter5. PHP interpreter processthe page by communicatingwith file system, databasesand email servers6. Deliver a web page to webserver to return to the userbrowser

5.PHP: Hypertext Preprocessor PHP is the Hypertext Preprocessor Script language Embedded into HTML Run as Apache module Can use DB (MySQL, Oracle, Microsoft SQL, PostgreSQL) Rich features: XML, PDF etc.,

6.Advantages of PHP FreePre-installed in Linux distributionsOpen SourceMultiplatformSimple, easy to learn and useProcedural language Compare with JavaScript which is event-driven C-like syntax - { } ;Extensive Function LibraryGood Web-server integration Script embedded in HTML Easy access to form data and output of HTML pages Not fully object-oriented Java is fully object oriented – all functions have to be in a class In PHP, classes are additional but quite simple to use

7.ArchitecturetouchBrowser(IE, FireFox,Opera)visionHTTPHTMLDesktop(PC or MAC)PHP scriptWeb Server(Apache, IIS)SQLDatabasetablesDatabaseServer

8.PHP: Variables, constant,operators and Control structures Variable var 123;Constant define(“Zipcode", 40508);Operators Assignment (e.g. , , * ) Arithmetic (e.g. , -, *) Comparison (e.g. , , , ) Logical (e.g. !, &&, )Control Structures Conditional (branching) structures (e.g. if/else) Repetition structures (e.g. while loops).

9.Datatypes Boolean Integer truefalse1000x34Floating pointArray array(“lexington", “hanoi", "london")array(“kentucky" “lexington", "vietnam" "hanoi", "england" "london") a[2] a["vietnam"]

10.String Data typeA string is a sequence of chars stringTest “this is a sequence of chars”;echo stringTest[0]; //output: techo stringTest; //output: this is a sequence of charsA single quoted strings is displayed “as-is” age 37; stringTest 'I am age years old'; // output: I am age years old stringTest “I am age years old”; // output: I am 37 years oldConcatenation conc ”is “.”a “.”composed “.”string”;echo conc; // output: is a composed string newConc 'Also conc '. conc;echo newConc; // output: Also conc is a composed string

11.Example ?phpPHP CODE GOES IN HERE? IP address: (Need to be in UK network to access)

12.FORM Handling GET GET['name']POST POST['name']

13.FORM Handling Example form action "test.php" method "post" table tr th Name: /th td input type "text" name "name" /td /tr tr th Age: /th td input type "text" name "age" /td /tr … /table /form HTML FORMname:age:Kausalya22submittest.php ? p Hello ? POST['name']? .You are ? POST['age']? years old. /p ? PHPHello Kausalya.You are 22 years old.

14.Example(2) – Loop manipulations


16.While Loops

17.Arrays and Functions


19.Returning Values from Functions

20.New Output

21.Including Files Simple use the include keyword and use thepath to the file you wish to include.Step 1: Create the file you wish to include.This example holds navigational links.

22.Step 2: Include the File in Code

23.New, Consistent Output

24.Function 1 (NoParameters)

25.Output (Function 1)

26.Function 2 (Pass byValue)

27.Output (Function 2)

28.Function 3 (Pass byReference)

29.Output (Function 3)

30.References Websites hagino/itss/ rudy/phpdemo1 example2/5.html Books PHP and MySQL Web Development 2nd Edition, Welling & Thomson Web Database Applications with PHP & MySQL, O’Reilly Publishers PHP Cookbook, O’Reilly Publishers MySQL Cookbook, O’Reilly Publishers “PHP and MySQL Web Development”, Luke Welling and Laura Thomson, SA Listservs thelist, (Note: very general and large volume of email)


PHP and MySQL Web Development 2nd Edition, Welling & Thomson Web Database Applications with PHP & MySQL, O’Reilly Publishers PHP Cookbook, O’Reilly Publishers

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