有時我們可能希望擴展一個被定義為「final」的第三方類別。

在此範例中，子類別將擴展一個「final」類別，並新增一個方法。物件實例將能夠存取父成員，並且會被識別為動態建立的子類別及其父類別的實例。

<?php
declare(strict_types=1);

/*
 * Final class would normally prevent extending.
 */
final class ParentC
{
 public $parentvar;
 public $secondvar;
 
 function __construct() { echo( "\r\n<br/>".$this->parentvar = 'set by '.get_class().'->parentconstruct' ); }
 function parentf() { echo( "\r\n<br/>".get_class().'->parentf >> '.$this->parentvar ); }
}

/*
 * Dynamically define a child class "DynamicC" 
 * which successfully extends final class "ParentC".
 */
$DefC = new \Componere\Definition( 'DynamicC', 'ParentC');

// Extend child class with method 'DynamicC::dynamicf()'.
$DefM = new Componere\Method( function( $parm = null ) {
 // Populate a parent class property.
 $this->secondvar = empty( $parm ) ? 'set by '.get_class().'->dynamicf' : $parm;
 // Access an inherited property set by parent constructor.
 echo( "\r\n<br/>".get_class().'->dynamicf >> '.$this->parentvar ); 
} );
$DefC->addMethod( 'dynamicf', $DefM );

// Take dynamic child class 'life'.
$DefC->register();

/*
 * Instantiate the dynamic child class,
 * and access its own and inherited members.
 */

$dyno = new DynamicC;
$dyno->parentf();
$dyno->dynamicf( 'myvalue ');

// Our object is also recognized as instance of parent!
var_dump( $dyno instanceof DynamicC, $dyno instanceof ParentC );
var_dump( $dyno ); 
%>

will output:

set by ParentC->parentconstruct 
ParentC->parentf >> set by ParentC->parentconstruct 
DynamicC->dynamicf >> set by ParentC->parentconstruct

(boolean) true
(boolean) true

object(DynamicC)
 public 'parentvar' => string 'set by ParentC->parentconstruct' (length=31)
 public 'secondvar' => string 'myvalue ' (length=8)

＋新增註解

Componere\Definition 類別

簡介

類別概要

目錄

發現問題了嗎？

使用者貢獻的註解 1 則註解