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<?xml version="1.0" encoding="utf-8"?>
<sect1 xml:id="migration83.new-features" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>New Features</title>
<sect2 xml:id="migration83.new-features.core">
<title>PHP Core</title>
<sect3 xml:id="migration83.new-features.core.readonly-modifier-improvements">
<title>Readonly Amendments</title>
<para>
Anonymous classes may now be marked as readonly.
</para>
<para>
Readonly properties can now be reinitialized during cloning.
<!-- RFC: https://wiki.php.net/rfc/readonly_amendments -->
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.typed-class-constants">
<title>Typed Class Constants</title>
<para>
Class, interface, trait, and enum constants now support type declarations.
<!-- RFC: https://wiki.php.net/rfc/typed_class_constants -->
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.closures-created-from-magic-methods">
<title>Closures created from magic methods</title>
<para>
Closures created from magic methods can now accept named arguments.
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.final-modifier-method-from-trait">
<title>The final modifier with a method from a trait</title>
<para>
The final modifier may now be used when using a method from a trait.
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.override-attribute">
<title>Override Attribute</title>
<para>
Added the #[\Override] attribute to check that a method exists in a parent
class or implemented interface.
<!-- RFC: https://wiki.php.net/rfc/marking_overriden_methods -->
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.fetch-class-constant-dynamically-syntax">
<title>Fetch class constant dynamically syntax</title>
<para>
Class constants can now be accessed dynamically using the
<code>C::{$name}</code> syntax.
<!-- RFC: https://wiki.php.net/rfc/dynamic_class_constant_fetch -->
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.static-variable-initializers">
<title>Static variable Initializers</title>
<para>
Static variable initializers can now contain arbitrary expressions.
<!-- RFC: RFC: https://wiki.php.net/rfc/arbitrary_static_variable_initializers -->
</para>
</sect3>
<sect3 xml:id="migration83.new-features.core.fallback-value-syntax-for-php-ini">
<title>Fallback value syntax for ini variables</title>
<para>
php.ini now supports fallback/default value syntax.
<!-- refs: https://github.com/php/php-src/pull/11351 -->
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
/*
On /path/to/user.ini contains the following settings:
listen = localhost:${DRUPAL_FPM_PORT:-9000}
*/
$user_ini = parse_ini_file('/path/to/user.ini');
echo $user_ini['listen']; // localhost:9000
]]>
</programlisting>
</informalexample>
</para>
</sect3>
</sect2>
<sect2 xml:id="migration83.new-features.cli">
<title>CLI</title>
<para>
It is now possible to lint multiple files.
</para>
</sect2>
<sect2 xml:id="migration83.new-features.dom">
<title>DOM</title>
<para>
Added properties <property>DOMElement::$className</property>
and <property>DOMElement::$id</property>.
These are not binary-safe at the moment because of underlying limitations
of libxml2.
This means that the property values will be cut off at a NUL byte.
</para>
<para>
Added properties <property>DOMNode::$isConnected</property>
and <property>DOMNameSpaceNode::$isConnected</property>.
</para>
<para>
Added properties <property>DOMNode::$parentElement</property>
and <property>DOMNameSpaceNode::$parentElement</property>.
</para>
</sect2>
<sect2 xml:id="migration83.new-features.ffi">
<title>FFI</title>
<para>
It is now possible to assign <classname>FFI\CData</classname> to other FFI\CData.
Meaning CData can now be assigned to structs and fields.
</para>
</sect2>
<sect2 xml:id="migration83.new-features.opcache">
<title>Opcache</title>
<para>
<code>opcache_get_status()['scripts'][n]['revalidate']</code> now contains
a Unix timestamp of when the next revalidation of the scripts timestamp is
due, dictated by the
<link linkend="ini.opcache.revalidate-freq">opcache.revalidate_freq</link>
INI directive.
</para>
</sect2>
<sect2 xml:id="migration83.new-features.posix">
<title>POSIX</title>
<para>
<function>posix_getrlimit</function> now takes an optional
<parameter>$resource</parameter> parameter to allow fetching a single resource limit.
</para>
<para>
<function>posix_isatty</function> now raises type warnings for integers
following the usual ZPP semantics.
</para>
<para>
<function>posix_ttyname</function> now raises type warnings for integers
following the usual ZPP semantics and value warnings for invalid file
descriptor integers.
</para>
</sect2>
<sect2 xml:id="migration83.new-features.streams">
<title>Streams</title>
<para>
Streams can now emit the <constant>STREAM_NOTIFY_COMPLETED</constant>
notification. This was previously not implemented.
</para>
</sect2>
</sect1>
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