<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Visibilidade</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Classes e Objetos (PHP 5)" HREF="language.oop5.html"><LINK REL="PREVIOUS" TITLE="Construtores and Destrutores" HREF="language.oop5.decon.html"><LINK REL="NEXT" TITLE="Operador de Resolução de Escopo (::)" HREF="language.oop5.paamayim-nekudotayim.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="sect1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="language.oop5.decon.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Capítulo 19. Classes e Objetos (PHP 5)</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="language.oop5.paamayim-nekudotayim.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="language.oop5.visibility" >Visibilidade</A ></H1 ><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 ><DIV CLASS="sect2" ><H2 CLASS="sect2" ><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 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN5667" ></A ><P ><B >Exemplo 19-9. Declaração de Membros</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><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> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><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 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN5678" ></A ><P ><B >Exemplo 19-10. Declaração de método</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><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="#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> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="language.oop5.decon.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="language.oop5.paamayim-nekudotayim.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Construtores and Destrutores</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="language.oop5.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Operador de Resolução de Escopo (::)</TD ></TR ></TABLE ></DIV ></BODY ></HTML >