訪問類屬性

Question

如何從類A中實例化的對象訪問類A的屬性。

像這樣;

class A() 
public var1; 
public obj1; 

function __construct(){ 
    $this->var1 = 'Hello World'; 
    $this->obj1 = new B(); 
} 

==============

class B() 

function anything(){ 
    #i want to access var1 from the calling class here ???? 
    # how do i access var1 in the calling class 
} 

Answer 1

有這樣做的直接方式。依賴注入是一種可能性：

class B { 

    protected $A = null; 

    public function __construct($A) { 
     $this->A = $A; 
    } 

    public function foo() { 
     $this->A->var1; 
    } 

} 

class A { 

    public function __construct() { 
     $this->obj1 = new B($this); 
    } 

}