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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@164122 c90b9560-bf6c-de11-be94-00142212c4b1
78 lines
2 KiB
XML
78 lines
2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.2 $ -->
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<sect1 id="language.oop5.interfaces">
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<title>Object Interfaces</title>
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<para>
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Object interfaces allow you to create code which specifies which methods
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and variables a class must implement, without having to define how these
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methods are handled.
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</para>
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<para>
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Interfaces are defined using the interface keyword, in the same way as a
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standard class, but without any of the methods having their contents
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defined. Classes which implement an interface should do so using the
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implements keyword, and must have definitions for all the methods listed
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in the interface. Classes may implement more than one interface if desired
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by listing each interface split by a space.
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</para>
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<para>
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Stating that a class implements an interface, and then not implementing all
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the methods in the interface will result in a fatal error telling you which
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methods have not been implemented.
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</para>
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<example>
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<title>Interface example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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interface ITemplate
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{
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public function setVariable($name, $var);
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public function getHtml($template);
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}
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class Template implements ITemplate
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{
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private $vars = array();
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public function setVariable($name, $var)
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{
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$this->vars[$name] = $var;
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}
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public function getHtml($template)
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{
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foreach($this->vars as $name => $value) {
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$template = str_replace('{'.$name.'}', $value, $template);
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}
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return $template;
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}
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}
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?>
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]]>
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</programlisting>
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</example>
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</sect1>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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