new-features.xml

<?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>$res</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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