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Класове и обекти
PHP Manual

Примери

В този пример, първо дефинираме базов клас и наследник на класа. Базовият клас описва общо растение, дали е ядливо или не и какъв е цветът му. Подкласът Spinach (спанак) добавя метод за сготвянето му и друг за проверка дали е сготвен.

Example #1 classes.inc

<?php

// базов клас с членове-променливи и методи
class Vegetable {

    var 
$edible;
    var 
$color;

    function 
Vegetable($edible$color="green"
    {
        
$this->edible $edible;
        
$this->color $color;
    }

    function 
is_edible() 
    {
        return 
$this->edible;
    }

    function 
what_color() 
    {
        return 
$this->color;
    }
    
// край на клас Vegetable

// наследява базовия клас
class Spinach extends Vegetable {

    var 
$cooked false;

    function 
Spinach() 
    {
        
$this->Vegetable(true"green");
    }

    function 
cook_it() 
    {
        
$this->cooked true;
    }

    function 
is_cooked() 
    {
        return 
$this->cooked;
    }
    
// край на клас Spinach

?>

След това инстанциираме 2 обекта от тези класове извеждаме информация за тях, включително тяхното класово потекло. Освен това дефинираме няколко полезни функции, главно за да имаме прегледно извеждане на променливите.

Example #2 test_script.php

<pre>
<?php

include "classes.inc";

// помощни функции

function print_vars($obj
{
    foreach (
get_object_vars($obj) as $prop => $val) {
        echo 
"\t$prop = $val\n";
    }
}

function 
print_methods($obj
{
    
$arr get_class_methods(get_class($obj));
    foreach (
$arr as $method) {
        echo 
"\tfunction $method()\n";
    }
}

function 
class_parentage($obj$class
{
    if (
is_subclass_of($GLOBALS[$obj], $class)) {
        echo 
"Object $obj belongs to class " get_class($$obj);
        echo 
" a subclass of $class\n";
    } else {
        echo 
"Object $obj does not belong to a subclass of $class\n";
    }
}

// инстанциира 2 обекта

$veggie = new Vegetable(true"blue");
$leafy = new Spinach();

// извежда информация за обектите
echo "veggie: CLASS " get_class($veggie) . "\n";
echo 
"leafy: CLASS " get_class($leafy);
echo 
", PARENT " get_parent_class($leafy) . "\n";

// извежда свойствата на veggie
echo "\nveggie: Properties\n";
print_vars($veggie);

// и методите на leafy
echo "\nleafy: Methods\n";
print_methods($leafy);

echo 
"\nParentage:\n";
class_parentage("leafy""Spinach");
class_parentage("leafy""Vegetable");
?>
</pre>

Важно нещо за отбелязване в горния пример е, че обектът $leafy (листат) е инстанция на класа Spinach (спанак), който е подклас на Vegetable (растение), и затова последната част от горния скрипт ще изведе:

   [...]
Parentage:
Object leafy does not belong to a subclass of Spinach
Object leafy belongs to class spinach a subclass of Vegetable


Класове и обекти
PHP Manual

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