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language.oop5.abstract.html | language.oop5.autoload.html | language.oop5.basic.html | language.oop5.cloning.html | language.oop5.constants.html | language.oop5.decon.html | language.oop5.final.html | language.oop5.html | language.oop5.inheritance.html | language.oop5.interfaces.html | language.oop5.iterations.html | language.oop5.late-static-bindings.html | language.oop5.magic.html | language.oop5.object-comparison.html | language.oop5.overloading.html | language.oop5.paamayim-nekudotayim.html | language.oop5.patterns.html | language.oop5.properties.html | language.oop5.references.html | language.oop5.serialization.html | language.oop5.static.html | language.oop5.typehinting.html | language.oop5.visibility.html | oop5.intro.html |
Classes e Objetos
PHP Manual

Autoloading Objects

Muitos desenvolvedores ao desenvolver aplicações orientadas a objeto criam um arquivo PHP para cada definição de classe. Um dos maiores contratempos é ter de escrever uma longa lista de includes no início de cada script(um include para cada classe necessária).

Com PHP 5 isso não é mais necessário. Você pode definir uma função __autoload que é automaticamente chamada no caso de você tentar usar uma classe/interface que ainda não foi definida. Ao chamar essa função o 'scripting engine' tem uma última chance para carregar a classe antes que o PHP falhe com erro.

Nota: Exceções disparadas em função __autoload não pode ser obtida num bloco catch, resultando em um erro fatal.

Nota: Autoloading não é disponível usando PHP em modo interativo CLI.

Nota: Se o nome da classe é usado e.g. em call_user_func() então ela pode conter alguns perigosos caracteres como ../. É recomendado não usar entrada de usuário nestas funções ou verificar a entrada na __autoload().

Exemplo #1 Exemplo de Autoload

Essse exemplo tenta carregar as classes MyClass1 e MyClass2 dos arquivos MyClass1.php e MyClass2.php respectivamente.

<?php
function __autoload($class_name) {
    require_once 
$class_name '.php';
}

$obj  = new MyClass1();
$obj2 = new MyClass2();
?>

Exemplo #2 Outro exemplo de Autoload

Este exemplo tenta carregar a interface ITest.

<?php

function __autoload($name) {
    
var_dump($name);
}

class 
Foo implements ITest {
}

/*
string(5) "ITest"

Fatal error: Interface 'ITest' not found in ...
*/
?>


Classes e Objetos
PHP Manual

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