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2010-05-26T10:37:27Z

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2010-05-26T07:00:49Z

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==A Class with a Constructor==



<source lang="html4strict">

<?php
class Item {
var $name;
function Item( $name="item") {
$this->name = $name;
}
function setName( $n) {
$this->name = $n;
}
function getName () {
return $this->name;
}
}
$item = new Item("5");
print $item->getName ();
?>

</source>

==Adding a Constructor to PriceItem==



<source lang="html4strict">

<?php
class Item {
private $name;
function __construct( $name="item", $code=0 ) {
$this->name = $name;
$this->code = $code;
}
function getName () {
return $this->name;
}
}
class PriceItem extends Item {
private $price;
function __construct( $name, $code, $price ) {
parent::__construct( $name, $code );
$this->price = $price;
}
function getName() {
return "(price) ".parent::getName ();
}
}
$item = new PriceItem ("widget", 5442, 5.20);
print $item->getName ();
?>

</source>

==Calling the constructor of the parent class==



<source lang="html4strict">

<?php
class Cat {
var $age;
function Cat($new_age){
$this->age = $new_age;
}
function Birthday( ){
$this->age++;
}
function Eat( ){
echo "Chomp chomp.";
}
function Meow( ){
echo "Meow.";
}
}
class MyCat extends Cat {
function MyCat($new_age) {
parent::Cat($new_age);
}
}
?>

</source>

==Constructors and Destructors==



<source lang="html4strict">

<?php
class SimpleClass {
function SimpleClass($param) {
echo "Created a new instance of SimpleClass!";
}
}
$myinstance = new SimpleClass;
?>

</source>

==Creating the Cat constructor==



<source lang="html4strict">

<?php
class Cat {
function Cat( ) {
}
}
?>

</source>

==Define and use constructor==



<source lang="html4strict">
<?php
class book {
private $title;
private $isbn;
private $copies;
public function __construct($isbn) {
$this->setIsbn($isbn);
$this->getTitle();
$this->getNumberCopies();
}
public function setIsbn($isbn) {
$this->isbn = $isbn;
}
public function getTitle() {
$this->title = "title";
print "Title: " . $this->title . " ";
}
public function getNumberCopies()
{
$this->copies = "5";
print "Number copies available: " . $this->copies." ";
}
}
$book = new book("1111");
?>

</source>

==Define class as constructor parameter==



<source lang="html4strict">
<?php
class PersonWriter {
function writeName( Person $p ) {
print $p->getName()."\n";
}
function writeAge( Person $p ) {
print $p->getAge()."\n";
}
}
class Person {
private $writer;
function __construct( PersonWriter $writer ) {
$this->writer = $writer;
}
function __call( $method, $args ) {
if ( method_exists( $this->writer, $method ) ) {
return $this->writer->$method( $this );
}
}
function getName() {
return "Joe";
}
function getAge() {
return 44;
}
}
$person= new Person( new PersonWriter() );
$person->writeName();
$person->writeAge();
?>

</source>

==Define Constructor for Class==



<source lang="html4strict">

<?php
class employee {
var $emp_code;
var $name;
var $address;
var $department;
var $sex;
var $date_of_birth;
var $salary;

function employee($empname) {
$this->emp_code="default value";
$this->name=$empname;
$this->address="default value";
$this->department="default value";
$this->sex="default value";
$this->date_of_birth="default value";
$this->salary="default value";
}
}
$dave = new employee("Dave Osbourne");
echo "Employee Code:",$dave->emp_code," \n";
echo "Name:",$dave->name," \n";
echo "Address:",$dave->address," \n";
echo "Department:",$dave->department," \n";
echo "Sex:",$dave->sex," \n";
echo "Salary:",$dave->salary," \n";
echo "Date of Birth:",$dave->date_of_birth," \n";
?>

</source>

==Defining an object constructor==



<source lang="html4strict">

class user {
public $username;
function __construct($username, $password) {
if ($this->validate_user($username, $password)) {
$this->username = $username;
}
}
}
$user = new user("A", "M");

</source>

==Defining object constructors in PHP 4==



<source lang="html4strict">

class user {
function user($username, $password) {
}
}

</source>

==Instantiate class by calling the constructor==



<source lang="html4strict">

<?php
class Staff
{
private $ein;
function __construct($ein)
{
if ($this->verify_ein($ein)) {
echo "called";
}
}

protected function verify_ein($ein)
{
return TRUE;
}
}
$employee = new Staff("123");
?>

</source>

==invoking parent constructors==



<source lang="html4strict">

<?php
class Staff
{
protected $name;
protected $title;
function __construct()
{
echo "Staff constructor called!";
}
}
class Manager extends Staff
{
function __construct()
{
parent::__construct();
echo "Manager constructor called!";
}
}
$employee = new Manager();
?>

</source>

==Using Default Constructors==



<source lang="html4strict">

<?php
class Dog {
function __construct($name="No-name", $breed="breed unknown", $price = 15) {
$this->name = $name;
$this->breed = $breed;
$this->price = $price;
}
}
$aDog = new Dog();
$tweety = new Dog("A", "a");
printf("%s is a %s and costs \$%.2f.\n",
$aDog->name, $aDog->breed, $aDog->price);
$tweety->price = 24.95;
printf("%s is a %s and costs \$%.2f.\n",
$tweety->name, $tweety->breed, $tweety->price);
?>

</source>

==Using the PHP 5 style constructor==



<source lang="html4strict">

<?php
class Cat {
Function __constructor( ){
}
}
?>

</source>

==Using Unified Constructors and Destructors==



<source lang="html4strict">

<?php
class SimpleClass {
function __construct($param) {
echo "Created a new instance of SimpleClass!";
}
function __destruct() {
echo "Destroyed this instance of SimpleClass";
}
}
$myinstance = new SimpleClass("value");
unset($myinstance);
?>

</source>

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PHP/Class/Constructor - История изменений

в 10:37, 26 мая 2010

Admin: 1 версия