language/oop5/paamayim-nekudotayim.xml
d6f54016d62904cfd8200604aadd5e3f0d9bad97
d6f54016d62904cfd8200604aadd5e3f0d9bad97
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<para>
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The Scope Resolution Operator (also called Paamayim Nekudotayim) or in
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simpler terms, the double colon, is a token that allows access to
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<link linkend="language.oop5.static">static</link>,
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<link linkend="language.oop5.constants">constant</link>, and overridden
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properties or methods of a class.
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a <link linkend="language.oop5.constants">constant</link>,
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<link linkend="language.oop5.static">static</link> property,
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or <link linkend="language.oop5.static">static</link> method
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of a class or one of its parents.
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Moreover, static properties or methods can be overriden via
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<link linkend="language.oop5.late-static-bindings">late static binding</link>.
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</para>
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<para>
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</para>
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<para>
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As of PHP 5.3.0, it's possible to reference the class using a variable.
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It's possible to reference the class using a variable.
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The variable's value can not be a keyword (e.g. <literal>self</literal>,
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<literal>parent</literal> and <literal>static</literal>).
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</para>
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}
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$classname = 'MyClass';
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echo $classname::CONST_VALUE; // As of PHP 5.3.0
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echo $classname::CONST_VALUE;
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echo MyClass::CONST_VALUE;
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?>
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<programlisting role="php">
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<![CDATA[
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<?php
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class MyClass {
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const CONST_VALUE = 'A constant value';
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}
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class OtherClass extends MyClass
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{
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public static $my_static = 'static var';
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@@ -69,7 +76,7 @@ class OtherClass extends MyClass
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}
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$classname = 'OtherClass';
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echo $classname::doubleColon(); // As of PHP 5.3.0
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$classname::doubleColon();
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OtherClass::doubleColon();
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?>
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</example>
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<para>
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When an extending class overrides the parents definition of a method,
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When an extending class overrides the parent's definition of a method,
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PHP will not call the parent's method. It's up to the extended class
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on whether or not the parent's method is called. This also applies to <link
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linkend="language.oop5.decon">Constructors and Destructors</link>, <link
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</para>
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</sect1>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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