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Um dos pontos-chave da programação orientada a objetos no PHP5 que é frequentemente mencionado é que "objetos são passados por referências por padrão". Isto não é completamente verdade. Esta seção retifica esse pensamento geral usando alguns exemplos.
Uma referência PHP é um alias, que permite duas variáveis diferentes escreverem para o mesmo valor. A partir do PHP5, uma variável objeto não contém mais o próprio objeto como valor. Ela contém um identificador do objeto que permite que os acessadores do objeto encontrem o objeto real. Quando um objeto é enviado por argumento, retornado ou atribuído para outra variável, as variáveis diferentes não são aliases: elas armazenam uma cópia do identificador, que aponta para o mesmo objeto.
Exemplo #1 Referências e Objetos
<?php
class A {
public $foo = 1;
}
$a = new A;
$b = $a; // $a and $b are copies of the same identifier
// ($a) = ($b) = <id>
$b->foo = 2;
echo $a->foo."\n";
$c = new A;
$d = &$c; // $c and $d are references
// ($c,$d) = <id>
$d->foo = 2;
echo $c->foo."\n";
$e = new A;
function foo($obj) {
// ($obj) = ($e) = <id>
$obj->foo = 2;
}
foo($e);
echo $e->foo."\n";
?>
O exemplo acima irá imprimir:
2 2 2
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