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- Document that order of class definition is important (closes #13165).
# Though the zend engine CAN handle class definitions not in the right order # this is not always true, especially when extending classes which extend # classes. See the report. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@85237 c90b9560-bf6c-de11-be94-00142212c4b1
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.34 $ -->
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<!-- $Revision: 1.35 $ -->
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<chapter id="language.oop">
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<title>Classes and Objects</title>
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@ -255,6 +255,25 @@ $ncart->add_item("10", 1); // (inherited functionality from cart)
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</programlisting>
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</informalexample>
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<para>
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This is also called a "parent-child" relationship. You create a class,
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parent, and use <literal>extends</literal> to create a new class
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<emphasis>based</emphasis> on the parent class: the child class. You can
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even use this new child class and create another class based on this child
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class.
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</para>
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<note>
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<para>
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Classes must be defined before they are used! If you want the class
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<literal>Named_Cart</literal> to extend the class
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<literal>Cart</literal>, you will have to define the class
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<literal>Cart</literal> first. If you want to create another class called
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<literal>Yellow_named_cart</literal> based on the class
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<literal>Named_Cart</literal> you have to define
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<literal>Named_Cart</literal> first. To make it short: the order in which
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the classes are defined is important.
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</para>
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</note>
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</sect1>
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<sect1 id="language.oop.constructor">
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