裏面定義函數範圍動態可變

Question

我有一個非常簡單的類：

class MyClass 
{ 
     public function someFunction() 
     { 
     echo array_key_exists('dynamicVariable', $GLOBALS) ? 'true' : 'false'; 
     } 
} 

我想定義「對飛」內部「someFunction」一個變量，但我似乎無法弄清楚如何在功能範圍內執行此操作。

$classInstance = new MyClass(); 

$varName = 'dynamicVariable'; 
$classInstance->$varName; 

我想要做什麼：

$classInstance = new MyClass(); 

$varName = 'dynamicVariable'; 
$classInstance->functionScopeReference->$varName; 


$classInstance->myFunction(); <-- this will print TRUE 

如何可以做同樣的事情，但在someFunction範圍界定，而不是MyClass的範圍呢，？由於

Answer 1

發佈的，以滿足OP一個社區維基，因爲dbf尚未發表評論以關閉該問題。

"Short answer, you can't from outside of the methods scope, unless the variable is a property used inside any method. – dbf"

...

"@dbf thank you! you can post this comment as an answer and I will mark it – 0x29a"

Answer 2

通過使用$this keyword ......我建議應對其解釋範圍更好，然後我可以面向對象編程的好101場......

class MyClass 
{ 
    public function someFunction($foo) 
    { 
     $this->dynamicVariable = $foo; 
    } 
} 

$classInstance = new MyClass(); 
$classInstance->someFunction('dynamicVariable'); 

echo $classInstance->dynamicVariable; 

編輯：爲了更好地回答OP的問題（對不起不讀的是正確的）：雖然它不改變範圍，解決方法是使用getter和setter方法，讓你的性私人：

class MyClass 
{ 
    private $property_one; // can't access this without using the getPropertyOne function 
    private $property_two; 

    public function setPropertyOne($bool) 
    { 
     $this->property_one = $bool; 
    } 

    public function getPropertyOne() 
    { 
     return $this->property_one; 
    } 

    public function setPropertyTwo($bool) 
    { 
     $this->property_two = $bool; 
    } 

    public function getPropertyTwo() 
    { 
     return $this->property_two; 
    } 
} 

$classInstance = new MyClass(); 

// trying to access the properties without using the functions results in an error 
echo $classInstance->property_one; 

$classInstance->setPropertyOne(true); 
echo $classInstance->getPropertyOne(); 

$classInstance->setPropertyTwo(false); 
echo $classInstance->getPropertyTwo();