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> PHP 5 introduz a palavra-chave 'final', que previne que classes filhas
sobrecarreguem um método ou variável. Basta prefixar a definição com 'final'.
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>Exemplo 19-29. Exemplo de métodos 'final'</B
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<font color="#0000BB"><?php<br /></font><font color="#007700">class </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">teste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"ClasseBase::teste() chamado\n"</font><font color="#007700">;<br /> }<br /> <br /> </font><font color="#0000BB">final public </font><font color="#007700">function </font><font color="#0000BB">maisTeste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"ClasseBase::maisTeste() chamado\n"</font><font color="#007700">;<br /> }<br />}<br /><br />class </font><font color="#0000BB">ClasseFilha </font><font color="#007700">extends </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">maisTeste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"ClasseFilha::maisTeste() called\n"</font><font color="#007700">;<br /> }<br />}<br /></font><font color="#FF8000">// Resulta em erro Fatal: Não pode sobrescrever método final ClasseBase::maisTeste()<br /></font><font color="#0000BB">?></font>
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>Exemplo 19-30. Exemplo de classe Final</B
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<font color="#0000BB"><?php<br />final </font><font color="#007700">class </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">teste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"Método ClasseBase::teste() chamado\n"</font><font color="#007700">;<br /> }<br /><br /> </font><font color="#FF8000">// Aqui não importa se você especificar a função como Final ou não<br /> </font><font color="#0000BB">final public </font><font color="#007700">function </font><font color="#0000BB">maisTeste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"Método ClasseBase::maisTeste() chamado\n"</font><font color="#007700">;<br /> }<br />}<br /><br />class </font><font color="#0000BB">ClasseFilha </font><font color="#007700">extends </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br />}<br /></font><font color="#FF8000">// Resulta em erro Fatal: A classe ClasseFilha não pode herdar de uma classe Final (ClasseBase)<br /></font><font color="#0000BB">?></font>
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