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<!-- $Revision$ -->
<sect1 xml:id="language.oop5.changelog" xmlns="http://docbook.org/ns/docbook">
 <title>OOP Changelog</title>
 <para>
  Changes to the PHP OOP model are logged here. Descriptions and other notes regarding
  these features are documented within the OOP model documentation.
 </para>
 <para>
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.4.0</entry>
      <entry>
       Added: Support for <link linkend="language.oop5.lazy-objects">Lazy Objects</link>.
      </entry>
     </row>
     <row>
      <entry>8.1.0</entry>
      <entry>
       Added: Support for the <modifier>final</modifier> modifier for class constants. Also, interface constants become overridable by default.
      </entry>
     </row>
     <row>
      <entry>8.0.0</entry>
      <entry>
       Added: Support for the <link linkend="language.oop5.basic.nullsafe">nullsafe operator</link> <emphasis>?-&gt;</emphasis> to access properties and methods on objects that may be null.
      </entry>
     </row>
     <row>
      <entry>7.4.0</entry>
      <entry>
       Changed: It is now possible to throw exception within
       <function>__toString</function>.
      </entry>
     </row>
     <row>
      <entry>7.4.0</entry>
      <entry>
       Added: Support for limited return type covariance and argument
       type contravariance. Full variance support is only available if
       autoloading is used. Inside a single file only non-cyclic type
       references are possible.
      </entry>
     </row>
     <row>
      <entry>7.4.0</entry>
      <entry>
       Added: It is now possible to type class properties.
      </entry>
     </row>
     <row>
      <entry>7.3.0</entry>
      <entry>
       Incompatibility: Argument unpacking of
       <classname>Traversable</classname>s with non-&integer; keys is no longer
       supported. This behaviour was not intended and thus has been removed.
      </entry>
     </row>
     <row>
      <entry>7.3.0</entry>
      <entry>
       Incompatibility: In previous versions it was possible to separate the
       static properties by assigning a reference. This has been removed.
      </entry>
     </row>
     <row>
      <entry>7.3.0</entry>
      <entry>
       Changed: The <link linkend="language.operators.type">instanceof</link>
       operator now allows literals as the first operand, in which case the
       result is always &false;.
      </entry>
     </row>
     <row>
      <entry>7.2.0</entry>
      <entry>
       Deprecated: The <function>__autoload</function> method has been
       deprecated in favour of <function>spl_autoload_register</function>.
      </entry>
     </row>
     <row>
      <entry>7.2.0</entry>
      <entry>
       Changed: The following name cannot be used to name classes, interfaces,
       or traits: <literal>object</literal>.
      </entry>
     </row>
     <row>
      <entry>7.2.0</entry>
      <entry>
       Changed: A trailing comma can now be added to the group-use syntax
       for namespaces.
      </entry>
     </row>
     <row>
      <entry>7.2.0</entry>
      <entry>
       Changed: Parameter type widening. Parameter types from overridden
       methods and from interface implementations may now be omitted.
      </entry>
     </row>
     <row>
      <entry>7.2.0</entry>
      <entry>
       Changed: Abstract methods can now be overridden when an abstract class
       extends another abstract class.
      </entry>
     </row>
     <row>
      <entry>7.1.0</entry>
      <entry>
       Changed: The following names cannot be used to name classes, interfaces,
       or traits: <literal>void</literal> and <literal>iterable</literal>.
      </entry>
     </row>
     <row>
      <entry>7.1.0</entry>
      <entry>
       Added: It is now possible to specify the
       <link linkend="language.oop5.visiblity-constants">visibility of
        class constants</link>.
      </entry>
     </row>
     <row>
      <entry>7.0.0</entry>
      <entry>
       Deprecated: <link linkend="language.oop5.static">Static</link> calls
       to methods that are not declared static.
      </entry>
     </row>
     <row>
      <entry>7.0.0</entry>
      <entry>
       Deprecated: PHP 4 style <link linkend="language.oop5.decon">
       constructor</link>. I.e. methods that have the same name as the class
       they are defined in.
      </entry>
     </row>
     <row>
      <entry>7.0.0</entry>
      <entry>
       Added: Group <emphasis>use</emphasis> declaration: classes, functions
       and constants being imported from the same namespace can now be grouped
       together in a single use statement.
      </entry>
     </row>
     <row>
      <entry>7.0.0</entry>
      <entry>
       Added: Support for
       <link linkend="language.oop5.anonymous">anonymous classes</link>
       has been added via <literal>new class</literal>.
      </entry>
     </row>
     <row>
      <entry>7.0.0</entry>
      <entry>
       Incompatibility: Iterating over a non-<classname>Traversable</classname>
       &object; will now have the same behaviour as iterating over by-reference
       &array;s.
      </entry>
     </row>
     <row>
      <entry>7.0.0</entry>
      <entry>
       Changed: Defining (compatible) properties in two used
       <link linkend="language.oop5.traits">traits</link> no longer
       triggers an error.
      </entry>
     </row>
     <row>
      <entry>5.6.0</entry>
      <entry>
       Added: The <link linkend="object.debuginfo">__debugInfo()</link> method.
      </entry>
     </row>
     <row>
      <entry>5.5.0</entry>
      <entry>
       Added: The <link linkend="language.oop5.basic.class.class">::class</link> magic constant.
      </entry>
     </row>
     <row>
      <entry>5.5.0</entry>
      <entry>
       Added: <link linkend="language.exceptions">finally</link> to handle exceptions.
      </entry>
     </row>
     <row>
      <entry>5.4.0</entry>
      <entry>
       Added: <link linkend="language.oop5.traits">traits</link>.
      </entry>
     </row>
     <row>
      <entry>5.4.0</entry>
      <entry>
       Changed: If an <link linkend="language.oop5.abstract">abstract</link> class
       defines a signature for the <link linkend="language.oop5.decon">
       constructor</link> it will now be enforced.
      </entry>
     </row>
     <row>
      <entry>5.3.3</entry>
      <entry>
       Changed: Methods with the same name as the last element of
       a <link linkend="language.namespaces">namespaced</link>
       class name will no longer be treated as <link
       linkend="language.oop5.decon">constructor</link>. This change doesn't
       affect non-namespaced classes.
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Changed: Classes that implement interfaces with methods that have default 
       values in the prototype are no longer required to match the interface's default 
       value.
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Changed: It's now possible to reference the class using a variable (e.g.,
       <literal>echo $classname::constant;</literal>).
       The variable's value can not be a keyword (e.g., <literal>self</literal>,
       <literal>parent</literal> or <literal>static</literal>).
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Changed: An <constant>E_WARNING</constant> level error is issued if
       the magic <link linkend="language.oop5.overloading">overloading</link>
       methods are declared <link linkend="language.oop5.static">static</link>.
       It also enforces the public visibility requirement.
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Changed: Prior to 5.3.0, exceptions thrown in the
       <function>__autoload</function> function could not be
       caught in the <link linkend="language.exceptions">catch</link> block, and
       would result in a fatal error. Exceptions now thrown in the __autoload function
       can be caught in the <link linkend="language.exceptions">catch</link> block, with
       one provison. If throwing a custom exception, then the custom exception class must
       be available. The __autoload function may be used recursively to autoload the
       custom exception class.
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Added: The <link linkend="language.oop5.overloading">__callStatic</link> method.
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Added: <link linkend="language.types.string.syntax.heredoc">heredoc</link>
       and <link linkend="language.types.string.syntax.nowdoc">nowdoc</link>
       support for class <emphasis>const</emphasis> and property definitions.
       Note: heredoc values must follow the same rules as double-quoted strings,
       (e.g. no variables within).
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Added: <link linkend="language.oop5.late-static-bindings">Late Static Bindings</link>.
      </entry>
     </row>
     <row>
      <entry>5.3.0</entry>
      <entry>
       Added: The <link linkend="object.invoke">__invoke()</link> method.
      </entry>
     </row>
     <row>
      <entry>5.2.0</entry>
      <entry>
       Changed: The <link linkend="object.tostring">__toString()</link>
       method was only called when it was directly combined with
       <function>echo</function> or <function>print</function>.
       But now, it is called in any &string; context (e.g. in
       <function>printf</function> with <literal>%s</literal> modifier) but not
       in other types contexts (e.g. with <literal>%d</literal> modifier).
       As of PHP 5.2.0, converting &object;s without a
       <link linkend="object.tostring">__toString</link> method to &string;
       emits a <constant>E_RECOVERABLE_ERROR</constant> level error.
      </entry>
     </row>
     <row>
      <entry>5.1.3</entry>
      <entry>
       Changed: In previous versions of PHP 5, the use of <literal>var</literal>
       was considered deprecated and would issue an <constant>E_STRICT</constant>
       level error. It's no longer deprecated, therefore does not emit the error.
      </entry>
     </row>
     <row>
      <entry>5.1.0</entry>
      <entry>
       Changed: The <link linkend="object.set-state">__set_state()</link> static
       method is now called for classes exported by <function>var_export</function>.
      </entry>
     </row>
     <row>
      <entry>5.1.0</entry>
      <entry>
       Added: The <link linkend="object.isset">__isset()</link>
       and <link linkend="object.unset">__unset()</link> methods.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </para>
</sect1>
 
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