php教程

The Componere\Definition class

(Componere 2 >= 2.1.0)

简介

The Definition class allows the programmer to build and register a type at runtime.

Should a Definition replace an existing class, the existing class will be restored when the Definition is destroyed.

类摘要

final Componere\Definition extends Componere\Abstract\Definition {
/* Constructors */
public __construct ( string $name )
public __construct ( string $name , string $parent )
public __construct ( string $name , array $interfaces )
public __construct ( string $name , string $parent , array $interfaces )
/* 方法 */
public addConstant ( string $name , \Componere\Value $value ) : Definition
public addProperty ( string $name , \Componere\Value $value ) : Definition
public register ( void ) : void
public isRegistered ( void ) : bool
public getClosure ( string $name ) : \Closure
public getClosures ( void ) : array
/* 继承的方法 */
public Componere\Abstract\Definition::addInterface ( string $interface ) : Definition
public Componere\Abstract\Definition::addMethod ( string $name , \Componere\Method $method ) : Definition
public Componere\Abstract\Definition::addTrait ( string $trait ) : Definition
public Componere\Abstract\Definition::getReflector ( void ) : \ReflectionClass
}

Table of Contents

User Contributed Notes

ASchmidt at Anamera dot net 20-Mar-2018 11:58
Sometimes we might wish to extend a third party class that has been defined as "final".

In this example, the a child class will extend a "final" class, adding a method. An object instance will be able to access parent members, and is recognized as an instance of both the dynamically created child class as well as its parent class.

<?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)

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