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>Capítulo 19. Classes e Objetos (PHP 5)</TD
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>Visibilidade</A
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><P
> A visibilidade de uma propriedade ou método pode ser definida prefixando a
declaração com as palavras-chave: 'public','protected' ou 'private'. Itens
declarados como public podem ser acessados por todo mundo. Protected limita o acesso a
classes herdadas (e para a classe que define o item). Private limita
a visibilidade para apenas a classe que define o item.
</P
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><H2
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><A
NAME="language.oop5.visiblity-members"
>Visibilidade dos membros</A
></H2
><P
> Membros de uma classe devem ser definidos com public, private, ou protected.
</P
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><P
><B
>Exemplo 19-9. Declaração de Membros</B
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><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#FF8000">/**<br /> * Define MinhaClasse<br /> */<br /></font><font color="#007700">class </font><font color="#0000BB">MinhaClasse<br /></font><font color="#007700">{<br /> </font><font color="#0000BB">public $publica </font><font color="#007700">= </font><font color="#DD0000">'Public'</font><font color="#007700">;<br /> </font><font color="#0000BB">protected $protegida </font><font color="#007700">= </font><font color="#DD0000">'Protected'</font><font color="#007700">;<br /> </font><font color="#0000BB">private $privada </font><font color="#007700">= </font><font color="#DD0000">'Private'</font><font color="#007700">;<br /><br /> function </font><font color="#0000BB">imprimeAlo</font><font color="#007700">()<br /> {<br /> echo </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">publica</font><font color="#007700">;<br /> echo </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">protegida</font><font color="#007700">;<br /> echo </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">privada</font><font color="#007700">;<br /> }<br />}<br /><br /></font><font color="#0000BB">$obj </font><font color="#007700">= new </font><font color="#0000BB">MinhaClasse</font><font color="#007700">();<br />echo </font><font color="#0000BB">$obj</font><font color="#007700">-></font><font color="#0000BB">publica</font><font color="#007700">; </font><font color="#FF8000">// Funciona<br /></font><font color="#007700">echo </font><font color="#0000BB">$obj</font><font color="#007700">-></font><font color="#0000BB">protegida</font><font color="#007700">; </font><font color="#FF8000">// Erro Fatal<br /></font><font color="#007700">echo </font><font color="#0000BB">$obj</font><font color="#007700">-></font><font color="#0000BB">privada</font><font color="#007700">; </font><font color="#FF8000">// Erro Fatal<br /></font><font color="#0000BB">$obj</font><font color="#007700">-></font><font color="#0000BB">imprimeAlo</font><font color="#007700">(); </font><font color="#FF8000">// Mostra Public, Protected e Private<br /><br /><br />/**<br /> * Define MinhaClasse2<br /> */<br /></font><font color="#007700">class </font><font color="#0000BB">MinhaClasse2 </font><font color="#007700">extends </font><font color="#0000BB">MinhaClasse<br /></font><font color="#007700">{<br /> </font><font color="#FF8000">// Nós podemos redeclarar as propriedades públicas e protegidas mas não as privadas<br /> </font><font color="#0000BB">protected $protegida </font><font color="#007700">= </font><font color="#DD0000">'Protected2'</font><font color="#007700">;<br /><br /> function </font><font color="#0000BB">imprimeAlo</font><font color="#007700">()<br /> {<br /> echo </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">publica</font><font color="#007700">;<br /> echo </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">protegida</font><font color="#007700">;<br /> echo </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">privada</font><font color="#007700">;<br /> }<br />}<br /><br /></font><font color="#0000BB">$obj2 </font><font color="#007700">= new </font><font color="#0000BB">MinhaClasse2</font><font color="#007700">();<br />echo </font><font color="#0000BB">$obj2</font><font color="#007700">-></font><font color="#0000BB">publica</font><font color="#007700">; </font><font color="#FF8000">// Works<br /></font><font color="#007700">echo </font><font color="#0000BB">$obj2</font><font color="#007700">-></font><font color="#0000BB">privada</font><font color="#007700">; </font><font color="#FF8000">// Undefined<br /></font><font color="#007700">echo </font><font color="#0000BB">$obj2</font><font color="#007700">-></font><font color="#0000BB">protegida</font><font color="#007700">; </font><font color="#FF8000">// Fatal Error<br /></font><font color="#0000BB">$obj2</font><font color="#007700">-></font><font color="#0000BB">imprimeAlo</font><font color="#007700">(); </font><font color="#FF8000">// Mostra Public, Protected2, not Private<br /><br /></font><font color="#0000BB">?></font>
</font>
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><B
>Nota: </B
>
O uso da declaração de variável com a
palavra-chave <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>var</I
></SPAN
> não é mais válida
para objetos do PHP 5. Para compatibilidade, presumirá-se que
uma variável declarada no php tenha visibilidade public, e um
aviso <TT
CLASS="constant"
><B
>E_STRICT</B
></TT
> será mostrado na tela.
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="language.oop5.visiblity-methods"
>Visibilidades de métodos</A
></H2
><P
> Métodos de classe devem ser definidos com public, private, ou protected. Métodos
sem qualquer declaração são definidas como public.
</P
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><B
>Exemplo 19-10. Declaração de método</B
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<font color="#0000BB"><?php<br /></font><font color="#FF8000">/**<br /> * Define MinhaClasse<br /> */<br /></font><font color="#007700">class </font><font color="#0000BB">MinhaClasse<br /></font><font color="#007700">{<br /> </font><font color="#FF8000">// Contrutores devem ser public<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">__construct</font><font color="#007700">() { }<br /><br /> </font><font color="#FF8000">// Declara um método public<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">MeuPublico</font><font color="#007700">() { }<br /><br /> </font><font color="#FF8000">// Declara um método protected<br /> </font><font color="#0000BB">protected </font><font color="#007700">function </font><font color="#0000BB">MeuProtegido</font><font color="#007700">() { }<br /><br /> </font><font color="#FF8000">// Declara um método private<br /> </font><font color="#0000BB">private </font><font color="#007700">function </font><font color="#0000BB">MeuPrivado</font><font color="#007700">() { }<br /><br /> </font><font color="#FF8000">// Esse é public<br /> </font><font color="#007700">function </font><font color="#0000BB">Foo</font><font color="#007700">()<br /> {<br /> </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">MeuPublico</font><font color="#007700">();<br /> </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">MeuProtegido</font><font color="#007700">();<br /> </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">MeuPrivado</font><font color="#007700">();<br /> }<br />}<br /><br /></font><font color="#0000BB">$minhaclasse </font><font color="#007700">= new </font><font color="#0000BB">MinhaClasse</font><font color="#007700">;<br /></font><font color="#0000BB">$minhaclasse</font><font color="#007700">-></font><font color="#0000BB">MeuPublico</font><font color="#007700">(); </font><font color="#FF8000">// Funciona<br /></font><font color="#0000BB">$minhaclasse</font><font color="#007700">-></font><font color="#0000BB">MeuProtegido</font><font color="#007700">(); </font><font color="#FF8000">// Erro Fatal<br /></font><font color="#0000BB">$minhaclasse</font><font color="#007700">-></font><font color="#0000BB">MeuPrivado</font><font color="#007700">(); </font><font color="#FF8000">// Erro Fatal<br /></font><font color="#0000BB">$minhaclasse</font><font color="#007700">-></font><font color="#0000BB">Foo</font><font color="#007700">(); </font><font color="#FF8000">// Public, Protected e Private funcionam<br /><br /><br />/**<br /> * Define MinhaClasse2<br /> */<br /></font><font color="#007700">class </font><font color="#0000BB">MinhaClasse2 </font><font color="#007700">extends </font><font color="#0000BB">MinhaClasse<br /></font><font color="#007700">{<br /> </font><font color="#FF8000">// Esse é public<br /> </font><font color="#007700">function </font><font color="#0000BB">Foo2</font><font color="#007700">()<br /> {<br /> </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">MeuPublico</font><font color="#007700">();<br /> </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">MeuProtegido</font><font color="#007700">();<br /> </font><font color="#0000BB">$this</font><font color="#007700">-></font><font color="#0000BB">MeuPrivado</font><font color="#007700">(); </font><font color="#FF8000">// Erro Fatal<br /> </font><font color="#007700">}<br />}<br /><br /></font><font color="#0000BB">$minhaclasse2 </font><font color="#007700">= new </font><font color="#0000BB">MinhaClasse2</font><font color="#007700">;<br /></font><font color="#0000BB">$minhaclasse2</font><font color="#007700">-></font><font color="#0000BB">MeuPublico</font><font color="#007700">(); </font><font color="#FF8000">// Funciona<br /></font><font color="#0000BB">$minhaclasse2</font><font color="#007700">-></font><font color="#0000BB">Foo2</font><font color="#007700">(); </font><font color="#FF8000">// Public e Protected funcionam, Private não<br /></font><font color="#0000BB">?></font>
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