1. CSCI 297 Scripting Languages Day Seven
Objects in PHP
CSCI 297 Scripting Languages
Day Seven

2. Declaring a Class and an Instance
<?php class User { public $name, $passwd, $balance; blah blah blah } $X = new User; print_r ($X);
User Object ( [name] => [passwd] => [balance] => )

3. Copying Instances $X = new User; $Y = $X; $X->name = "Bob";
$Y->name = "Sue"
echo $X->name . "<br>";
echo $Y->name . "<br>";
$Y = clone $X;
Sue

4. Accessing Public Properties and Public Functions
$X->name = "Bob Smith";
$X->balance = 0.0;
==================
$amt_due = $X->get_balance();
$X->set_balance(99.99);

5. Declaring Methods
function get_balance() { return $this->balance; } function set_balance ($param) $this->balance = $param;

6. Declaring Properties 1 of 3
Legal, but VERY bad idea
class User {} // that's legal!!!
$X = new User;
$X->name = "Sue"; // now X has a new property

7. Declaring Properties 2 of 3
class User { var $name; // name is public public $balance; private $passwd; protected $something; }

8. Declaring Properties 3 of 3
class User { static $static_property; ... =================== $X = new User; $X->static_property = "Bob"; // illegal User::static_property = "Bob"; // legal

9. Constructors & Destructors
class User { function _construct() $this->balance = 0.0; } function _destruct() blah blah

10. Subclasses
class Customer extends User { function _construct() parent::_construct(); }