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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@175911 c90b9560-bf6c-de11-be94-00142212c4b1
69 lines
1.9 KiB
XML
69 lines
1.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.5 $ -->
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<sect1 id="language.oop5.autoload">
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<title>Autoloading Objects</title>
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<para>
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Many developers writing object-oriented applications create
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one PHP source file per-class definition. One of the biggest
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annoyances is having to write a long list of needed includes
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at the beginning of each script (one for each class).
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</para>
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<para>
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In PHP 5, this is no longer necessary. You may define an
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__autoload function which is automatically
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called in case you are trying to use a class which hasn't been
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defined yet. By calling this function the scripting engine is given
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a last chance to load the class before PHP fails with an error.
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</para>
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<note>
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<para>
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Exceptions thrown in __autoload function cannot be catched in the
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<link linkend="language.exceptions">catch</link> block and result in fatal
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error.
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</para>
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</note>
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<para>
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<example>
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<title>Autoload example</title>
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<para>
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This example attempts to load the classes <literal>MyClass1</literal>
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and <literal>MyClass2</literal> from the files <filename>MyClass1.php</filename>
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and <filename>MyClass2.php</filename> respectively.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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function __autoload($class_name) {
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require_once $class_name . '.php';
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}
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$obj = new MyClass1();
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$obj2 = new MyClass2();
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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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</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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