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