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Classes/Objetos
PHP Manual

Exemplos

Neste exemplo, nós primeiramente definiremos uma classe base e uma extensão da classe. A classe base descreve um vegetal comum, que é comestível ou não e que tem sua cor. A sub-classe Espinafre adiciona um método para cozinhá-lo e outro para descobrir se ele está cozido.

Exemplo #1 classes.inc

<?php

// Classe base com propriedades e métodos de membros
class Vegetal {

    var 
$comestivel;
    var 
$cor;

    function 
Vegetal($comestivel$cor="verde")
    {
        
$this->comestivel $comestivel;
        
$this->cor $cor;
    }

    function 
is_comestivel()
    {
        return 
$this->comestivel;
    }

    function 
qual_cor()
    {
        return 
$this->cor;
    }

// Fim da classe Vegetal

// estende a classe base
class Espinafre extends Vegetal {

    var 
$cozido false;

    function 
Espinafre()
    {
        
$this->Vegetaltrue"verde" );
    }

    function 
cozinhe()
    {
        
$this->cozido true;
    }

    function 
esta_cozido()
    {
        return 
$this->cozido;
    }

// Fim da classe Espinafre

?>

Nós instanciamos 2 objetos destas classes e exibimos informações sobre elas, incluindo o parentesco de suas classes. Nós também definimos algumas funções úteis, principalmente para ter uma boa saída de variáveis.

Exemplo #2 test_script.php

<pre>
<?php

include "classes.inc";

// utility functions

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";
}
}

// instantiate 2 objects

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

// print out information about objects
echo "veggie: CLASS " get_class($veggie) . "\n";
echo 
"leafy: CLASS " get_class($leafy);
echo 
", PARENT " get_parent_class($leafy) . "\n";

// show veggie properties
echo "\nveggie: Properties\n";
print_vars($veggie);

// and leafy methods
echo "\nleafy: Methods\n";
print_methods($leafy);

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

Uma coisa importante para se notar no exemplo acima é que o objeto $folheado é uma instância da classe Espinafre que é uma subclasse de Vegetal, então a última parte do script acima exibirá:

   [...]
Parentesco:
Objeto folheado não pertence a uma subclasse de Espinafre
Object folheado pertence à classe Espinafre uma subclasse de Vegetal


Classes/Objetos
PHP Manual

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