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Properties do not need to be declared with a visibility modifier (#1311)

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Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>
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George Peter Banyard 2022-01-08 18:58:14 +00:00 committed by GitHub
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32
language/oop5/properties.xml
View file

@ -7,34 +7,33 @@
Class member variables are called <emphasis>properties</emphasis>.
They may be referred to using other terms such as <emphasis>fields</emphasis>,
but for the purposes of this reference <emphasis>properties</emphasis>
will be used. They are defined by using one of the keywords
<literal>public</literal>, <literal>protected</literal>, or
<literal>private</literal>, optionally, as of PHP 7.4,
will be used. They are defined by using at least one modifier (such as
<xref linkend="language.oop5.visibility"/>,
<xref linkend="language.oop5.static"/>,
or, as of PHP 8.1.0, <code>readonly</code>),
optionally (except for <code>readonly</code> properties), as of PHP 7.4,
followed by a type declaration, followed by a normal variable declaration.
This declaration may include an initialization, but this initialization
must be a <link linkend="language.constants">constant</link> value.
</para>
<para>
See <xref linkend="language.oop5.visibility" /> for more
information on the meanings
of <literal>public</literal>, <literal>protected</literal>,
and <literal>private</literal>.
</para>
<note>
<para>
An alternative and not recommended way of declaring class properties, as it is to maintain backward
compatibility with PHP 4, is by using
the <literal>var</literal> keyword.
It will treat the property identically as it would have been
declared as <literal>public</literal>.
An obsolete way of declaring class properties, is by using the
<literal>var</literal> keyword instead of a modifier.
</para>
</note>
<note>
<simpara>
A property declared without a <xref linkend="language.oop5.visibility"/>
modifier will be declared as <literal>public</literal>.
</simpara>
</note>
<para>
Within class methods non-static properties may be accessed by using
<literal>-&gt;</literal> (Object Operator): <varname>$this-&gt;property</varname>
(where <literal>property</literal> is the name of the property).
Static properties are accessed by using the <literal>::</literal> (Double Colon):
<varname>self::$property</varname>. See <link linkend="language.oop5.static">Static Keyword</link>
<varname>self::$property</varname>. See <xref linkend="language.oop5.static" />
for more information on the difference between static and non-static properties.
</para>
<para>
@ -68,6 +67,9 @@ EOD;
hello world
EOD;
}
// Without visibility modifier:
static $var9;
readonly int $var10;
?>
]]>
</programlisting>

6
language/oop5/visibility.xml
View file

@ -16,9 +16,9 @@
<sect2 xml:id="language.oop5.visibility-members">
<title>Property Visibility</title>
<para>
Class properties must be defined as public, private, or
protected. If declared using <literal>var</literal>,
the property will be defined as public.
Class properties may be defined as public, private, or
protected. Properties declared without any explicit visibility
keyword are defined as public.
</para>
<para>
<example>