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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<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.property-hooks">Property Hooks</link>.
</entry>
</row>
<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>?-></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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