1. Wildan Maulana | wildan [at] tobethink.com Object Oriented Programming with PHP 5 #2

3. Let's Bake Some Objects <? //emailer.class..php class Emailer { private $sender; private $recipients; private $subject; private $body; function __construct($sender) { $this->sender = $sender; $this->recipients = array(); } public function addRecipients($recipient) { array_push($this->recipients, $recipient); } public function setSubject($subject) { $this->subject = $subject; } public function setBody($body) { $this->body = $body; } public function sendEmail() { foreach ($this->recipients as $recipient) { $result = mail($recipient, $this->subject, $this->body, &quot;From: {$this->sender}&quot;); if ($result) { echo &quot;Mail successfully sent to {$recipient}<br/>&quot;; } } } } ?>

14. Constructors and Destructors #2 <? //factorial.class.php class factorial { private $result = 1;// you can initialize directly outside private $number; function __construct($number) { $this->number = $number; for($i=2; $i<=$number; $i++) { $this->result *= $i; } } public function showResult() { echo &quot;Factorial of {$this->number} is {$this->result}. &quot;; } } ?>

17. Class Constants#2 <? include_once(&quot;class.wordcounter.php&quot;); $wc = new WordCounter(&quot;words.txt&quot;); $wc->count(WordCounter::DESC); ?>

19. Extending a Class [Inheritance] #2 <? class HtmlEmailer extends emailer { public function sendHTMLEmail() { foreach ($this->recipients as $recipient) { $headers = 'MIME-Version: 1.0' . &quot;&quot;; $headers .= 'Content-type: text/html; charset=iso-8859-1' . &quot;&quot;; $headers .= 'From: {$this->sender}' . &quot;&quot;; $result = mail($recipient, $this->subject, $this->body, $headers); if ($result) echo &quot;HTML Mail successfully sent to {$recipient}<br/>&quot;; } } } ?>

20. Extending a Class [Inheritance] #3 <? include_once(&quot;class.htmlemailer.php&quot;); $hm = new HtmlEmailer(); //.... do other things $hm->sendEmail(); $hm->sendHTMLEmail(); ?>

25. <? include(&quot;emailer.class.php&quot;); include(&quot;extendedemailer.class.php&quot;); include(&quot;htmlemailer.class.php&quot;); $emailer = new Emailer(&quot;hasin@somewherein.net&quot;); $extendedemailer = new ExtendedEmailer(); $htmlemailer = new HtmlEmailer(&quot;hasin@somewherein.net&quot;); if ($extendedemailer instanceof emailer ) echo &quot;Extended Emailer is Derived from Emailer.<br/>&quot;; if ($htmlemailer instanceof emailer ) echo &quot;HTML Emailer is also Derived from Emailer.<br/>&quot;; if ($emailer instanceof htmlEmailer ) echo &quot;Emailer is Derived from HTMLEmailer.<br/>&quot;; if ($htmlemailer instanceof extendedEmailer ) echo &quot;HTML Emailer is Derived from Emailer.<br/>&quot;; ?> Extended Emailer is Derived from Emailer. HTML Emailer is also Derived from Emailer. The output

27. Interface #2 <? //dbdriver.interface.php interface DBDriver { public function connect(); public function execute($sql); } ?> <? //mysqldriver.class.php include(&quot;dbdriver.interface.php&quot;); class MySQLDriver implements DBDriver { } ?> implement Error !

28. Interface #2 <? //dbdriver.interface.php interface DBDriver { public function connect(); public function execute($sql); } ?> <? include(&quot;interface.dbdriver.php&quot;); class MySQLDriver implements DBDriver { public function connect() { //connect to database } public function execute() { //execute the query and output result } } ?> implement Error ! The execute() does'nt have an argument

29. Interface #3 <? //dbdriver.interface.php interface DBDriver { public function connect(); public function execute($sql); } ?> <? include(&quot;interface.dbdriver.php&quot;); class MySQLDriver implements DBDriver { public function connect() { //connect to database } public function execute() { //execute the query and output result } } ?> implement public function execute($query) { //execute the query and output result } Error ! The execute() does'nt have an argument Should have one argument

31. Abstract Class #2 <?php //reportgenerator.abstract.php abstract class ReportGenerator { public function generateReport($resultArray) { //write code to process the multidimensional result array and //generate HTML Report } } ?>

32. Abstract Class #3 <?php include(&quot;dbdriver.interface.php&quot;); include(&quot;reportgenerator.abstract.php&quot;); class MySQLDriver extends ReportGenerator implements DBDriver { public function connect() { //connect to database } public function execute($query) { //execute the query and output result } // You need not declare or write the generateReport method here //again as it is extended from the abstract class directly.&quot; } ?>

35. Static Method and Properties #2 <?php //dbmanager.class.php class DBManager { public static function getMySQLDriver() { //instantiate a new MySQL Driver object and return } public static function getPostgreSQLDriver() { //instantiate a new PostgreSQL Driver object and return } public static function getSQLiteDriver() { //instantiate a new MySQL Driver object and return } } ?>

37. How static property actually works ? <?php //statictester.class.php class StaticTester { private static $id=0; function __construct() { self::$id +=1; } public static function checkIdFromStaticMehod() { echo &quot;Current Id From Static Method is &quot;.self::$id.&quot;&quot;; } public function checkIdFromNonStaticMethod() { echo &quot;Current Id From Non Static Method is &quot;.self::$id.&quot;&quot;; } } $st1 = new StaticTester(); StaticTester::checkIdFromStaticMehod(); $st2 = new StaticTester(); $st1->checkIdFromNonStaticMethod(); //returns the val of $id as 2 $st1->checkIdFromStaticMehod(); $st2->checkIdFromNonStaticMethod(); $st3 = new StaticTester(); StaticTester::checkIdFromStaticMehod(); ?> Current Id From Static Method is 1 Current Id From Non Static Method is 2 Current Id From Static Method is 2 Current Id From Non Static Method is 2 Current Id From Static Method is 3 The Output : Using this special facility, a special design pattern &quot;Singleton&quot; works perfectly in PHP.

39. Accesor Methods <?php class Student { private $name; private $roll; public function setName($name) { $this->name= $name; } public function setRoll($roll) { $this->roll =$roll; } public function getName() { return $this->name; } public function getRoll() { return $this->roll; } } ?> But what happen if we have lots of properties ? Do we have to create accesor method for all the properties ? No ..! We can use magic method to achieve this...

41. Using Magic Method to Set/Get Class Properties #2 <?php //student.class.php class Student { private $properties = array(); function __get($property) { return $this->properties[$property]; } function __set($property, $value) { $this->properties[$property]=&quot;AutoSet {$property} as: &quot;.$value; } } ?> <?php $st = new Student(); $st->name = &quot;Afif&quot;; $st->roll=16; echo $st->name.&quot;&quot;; echo $st->roll; ?> AutoSet name as: Afif AutoSet roll as: 16

43. Magic Methods for Overloading Class Methods <?php class Overloader { function __call($method, $arguments) { echo &quot;You called a method named {$method} with the following arguments <br/>&quot;; print_r($arguments); echo &quot;<br/>&quot;; } } $ol = new Overloader(); $ol->access(2,3,4); $ol->notAnyMethod(&quot;boo&quot;); ?> You called a method named access with the following arguments Array ( [0] => 2 [1] => 3 [2] => 4 ) You called a method named notAnyMethod with the following arguments Array ( [0] => boo )

44. Visually Representing Class

46. Q&A