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The content for the static keyword.

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@163427 c90b9560-bf6c-de11-be94-00142212c4b1
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Curt Zirzow 2004-07-16 04:15:30 +00:00
parent 9d0a1e7664
commit d62a61a076
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75
language/oop5/static.xml
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@ -1,11 +1,80 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.1 $ -->
<!-- $Revision: 1.2 $ -->
<sect1 id="language.oop5.static">
<title>Static</title>
<title>Static Keyword</title>
<para>
.
Declaring class members or methods as static, makes them callable
from outside the object context. A member or method declared
with static can not be accessed with a variable that is an instance
of the object and cannot be re-defined in an extending class.
</para>
<para>
The static declaration must be after the visibilty declaration. For
compatibility with PHP 4, if no <link
linkend="language.oop5.visibility">visibility</link>
declaration is used, then the member or method will be treated
as if it was declared as <literal>public static</literal>.
</para>
<para>
Because static methods are callable without an instance of
the object created, the pseudo variable <varname>$this</varname> is
not available inside the method declared as static.
</para>
<example>
<title>Static member example</title>
<programlisting role="php">
<![CDATA[
<?php
class Foo {
public static $my_static = 'foo';
public function staticValue() {
return self::$my_static;
}
}
class Bar extends Foo {
public function fooStatic() {
return parent::$my_static;
}
}
print Foo::$my_static . "\n";
$foo = new Foo();
print $foo->staticValue() . "\n";
print $foo->my_static . "\n"; // Undefined my_static
print Bar::$my_static . "\n";
$bar = new Bar();
print $bar->fooStatic() . "\n";
?>
]]>
</programlisting>
</example>
<example>
<title>Static method example</title>
<programlisting role="php">
<![CDATA[
<?php
class Foo {
public static function aStaticMethod() {
// ...
}
}
Foo::aStaticMethod();
?>
]]>
</programlisting>
</example>
</sect1>