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https://github.com/sigmasternchen/php-doc-en
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fddb6fb793
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@344924 c90b9560-bf6c-de11-be94-00142212c4b1
103 lines
2.4 KiB
XML
103 lines
2.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<sect1 xml:id="language.types.object">
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<title>Objects</title>
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<sect2 xml:id="language.types.object.init">
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<title>Object Initialization</title>
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<para>
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To create a new <type>object</type>, use the <literal>new</literal> statement
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to instantiate a class:
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</para>
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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class foo
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{
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function do_foo()
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{
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echo "Doing foo.";
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}
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}
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$bar = new foo;
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$bar->do_foo();
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?>
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]]>
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</programlisting>
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</informalexample>
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<simpara>
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For a full discussion, see the
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<link linkend="language.oop5">Classes and Objects</link> chapter.
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</simpara>
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</sect2>
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<sect2 xml:id="language.types.object.casting">
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<title>Converting to object</title>
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<para>
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If an <type>object</type> is converted to an <type>object</type>, it is not
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modified. If a value of any other type is converted to an
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<type>object</type>, a new instance of the <literal>stdClass</literal>
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built-in class is created. If the value was &null;, the new instance will be
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empty. An <type>array</type> converts to an <type>object</type> with properties
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named by keys and corresponding values. Note that in this case before PHP 7.2.0 numeric keys
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have been inaccessible unless iterated.
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</para>
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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$obj = (object) array('1' => 'foo');
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var_dump(isset($obj->{'1'})); // outputs 'bool(true)' as of PHP 7.2.0; 'bool(false)' previously
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var_dump(key($obj)); // outputs 'string(1) "1"' as of PHP 7.2.0; 'int(1)' previously
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?>
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]]>
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</programlisting>
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</informalexample>
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<para>
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For any other value, a member variable named <literal>scalar</literal> will contain
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the value.
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</para>
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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$obj = (object) 'ciao';
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echo $obj->scalar; // outputs 'ciao'
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?>
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]]>
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</programlisting>
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</informalexample>
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</sect2>
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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:"~/.phpdoc/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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