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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@192329 c90b9560-bf6c-de11-be94-00142212c4b1
59 lines
1.4 KiB
XML
59 lines
1.4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<sect1 id="language.oop5.constants">
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<title>Class Constants</title>
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<para>
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It is possible to define constant values on a per-class basis remaining the
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same and unchangeable. Constants differ from normal variables in that you
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don't use the <varname>$</varname> symbol to declare or use them. Like
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<link linkend="language.oop5.static">static</link> members, constant values
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cannot be accessed from an instance of the object (using
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<literal>$object::constant</literal>).
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</para>
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<example>
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<title>Defining and using a constant</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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class MyClass
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{
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const constant = 'constant value';
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function showConstant() {
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echo self::constant . "\n";
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}
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}
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echo MyClass::constant . "\n";
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$class = new MyClass();
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$class->showConstant();
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// echo $class::constant; is not allowed
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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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