Pesquisas recentes:
classobj functions ,
include functions ,
variable functions ,
post functions
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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->Vegetal( true, "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
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