mirror of
https://github.com/sigmasternchen/php-doc-en
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2fafe7cb57
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@162511 c90b9560-bf6c-de11-be94-00142212c4b1
81 lines
2.3 KiB
XML
81 lines
2.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.5 $ -->
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<!-- splitted from ./en/functions/classobj.xml, last change in rev 1.11 -->
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<refentry id="function.class-exists">
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<refnamediv>
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<refname>class_exists</refname>
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<refpurpose>Checks if the class has been defined</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>bool</type><methodname>class_exists</methodname>
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<methodparam><type>string</type><parameter>class_name</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter></methodparam>
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</methodsynopsis>
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<note>
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<para>
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The <parameter>autoload</parameter> parameter was added in PHP 5
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</para>
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</note>
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<para>
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This function returns &true; if the class given by
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<parameter>class_name</parameter> has been defined,
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&false; otherwise.
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</para>
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<para>
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<function>class_exists</function> will attempt to call __autoload by
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default, if you don't want <function>class_exists</function> to
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call __autoload(), you can set the parameter <parameter>autoload</parameter>
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to &false;.
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</para>
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<para>
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<example>
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<title><parameter>autoload</parameter> parameter example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function __autoload($class) {
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include($class . '.php');
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/* Check to see it the include defined the class */
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if ( !class_exists($class, false) ) {
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trigger_error("Unable to load class $class", E_USER_ERROR);
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}
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}
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if( class_exists('MyClass') ) {
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$myclass = new MyClass();
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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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</para>
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<simpara>
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See also <function>get_declared_classes</function>.
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</simpara>
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</refsect1>
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</refentry>
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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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