數組和覆蓋（沒有全局數組）

Question

我如何覆蓋其他類中的表，並在第一個和三個字段中顯示它？

<?php 

class A { 
    public $tab = array(); 

    public function wyswietl() { 
    $this->tab['id'] = '1'; 
    foreach ($this->tab as $key => $value) { 
     print $key .' = '. $value; 
    } 
    } 
} 

class B { 
    public function dodajB() { 
    $this->tab['desc'] = 'descriptions'; 
    } 
} 

class C 
{ 
    public function dodajC() { 
    $this->tab['name'] = 'names'; 
    } 
} 

$ob = new A; 

$ob2 = new B; 
$ob2->dodajB(); 

$ob3 = new C; 
$ob3->dodajC(); 

$ob->wyswietl(); 

?> 

Answer 1

的作業被定義爲A級的目的是讓你將需要使這一切三列C類並且C從B擴展到A，我還建議使用__construct函數爲您構建對象。你也引用了一個局部變量tab而不是class引用它來引用它。

見下面該代碼執行上述所有的：

<?php 

class A 
{ 
    public $tab = array(); 

    public function __construct() 
    { 
     $this->tab['id'] = '1'; 
    } 

    public function wyswietl() 
    { 
     foreach ($this->tab as $key => $value) 
     { 
      print $key .' = '. $value . "\n"; 
     } 
    } 
} 

class B extends A 
{ 
    public function __construct() 
    { 
     parent::__construct(); 
     $this->tab['desc'] = 'descriptions'; 
    } 
} 

class C extends B 
{ 
    public function __construct() 
    { 
     parent::__construct(); 
     $this->tab['name'] = 'names'; 
    } 
} 

$ob = new A; 

$ob2 = new B; 
$ob3 = new C; 

echo 'A: '; 
$ob->wyswietl(); 
echo "\n\n"; 

echo 'B: '; 
$ob2->wyswietl(); 
echo "\n\n"; 

echo 'C: '; 
$ob3->wyswietl(); 
echo "\n\n"; 

?> 

Answer 2

你的問題是混亂的，但我認爲你正在尋找：

class B extends A { 
    public function dodajB(){ 
     $this->tab['desc'] = 'descriptions'; 
    } 
} 

class C extends B { 
    ...