в 10:37, 26 мая 2010

2010-05-26T10:37:27Z

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2010-05-26T07:00:44Z

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==Accessing instance-specific data within a destructor==



<source lang="html4strict">

class Database {
function __destruct() {
db_close($this->handle);
}
}

</source>

==Class destructors==



<source lang="html4strict">
<?php
class Book
{
private $title;
private $isbn;
private $copies;
function __construct($isbn)
{
echo "Book class instance created.";
}
function __destruct()
{
echo "Book class instance destroyed.";
}
}
$book = new Book("1111");
?>

</source>

==Class with destructors==



<source lang="html4strict">

<?php
class Book
{
private $title;
private $isbn;
private $copies;
function __construct($isbn)
{
echo "Book class instance created.";
}
function __destruct()
{
echo "Book class instance destroyed.";
}
}
$book = new Book("111111111111");
?>

</source>

==Cleaning Up with the __destruct Method (PHP 5 Only)==



<source lang="html4strict">

<?php
class ItemUpdater {
public function update( Item $item ) {
print "updating.. ";
print $item->name;
}
}
class Item {
public $name = "item";
private $updater;
public function setUpdater( ItemUpdater $update ) {
$this->updater=$update;
}
function __destruct() {
if ( ! empty( $this->updater )) {
$this->updater->update( $this );
}
}
}
$item = new Item();
$item->setUpdater( new ItemUpdater() ) ;
unset( $item );
?>

</source>

==Declaring and Using Object Constructors and Destructors==



<source lang="html4strict">

<?php
class cd {
public $artist;
public $title;
protected $tracks;
private $disk_id;
public function __construct() {
$this->disk_id = sha1("cd" . time() . rand());
}
public function get_disk_id() {
return $this->disk_id;
}
}
$mydisk = new cd();
echo $mydisk->get_disk_id();
?>

</source>

==Defining an object destructor==



<source lang="html4strict">

class car {
function __destruct() {
}
}

</source>

==destuctor in action==



<source lang="html4strict">

<?php
class Person {
protected $name;
private $age;
private $id;
function __construct( $name, $age ) {
$this->name = $name;
$this->age = $age;
}
function setId( $id ) {
$this->id = $id;
}

function __destruct() {
if ( ! empty( $this->id ) ) {
print "saving person\n";
}
}
}
$person = new Person( "Joe", 31 );
$person->setId( 111 );
unset( $person );
?>

</source>

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в 10:37, 26 мая 2010

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