我在对象中编写一个函数，需要访问创建对象时构造的数组。我可以使用$this->var访问函数内的正常变量，但我不能以同样的方式使用$this->array['key']访问数组。为什么我的函数不能使用数组?
下面是有问题的代码:
class User
{
public $_x;
public $_y;
public $_z;
public $_array;
public function __construct($username)
{
$_x = 'a';
$_y = 'b';
$_z = 'c';
$_array = array( 'red' => $_x, 'blue' => $_y, 'green' => $_z,);
}
public function myFunction()
{
echo $this->_x . "<br>";
echo $this->_y . "<br>";
echo $this->_z . "<br>";
echo $this->_array['red'] . "<br>";
echo $this->_array['blue'] . "<br>";
echo $this->_array['green'] . "<br>";
var_dump($this->_array);
}
}
$user = new User;
$user->myFunction();
显示:
b c 零你忘了$this:
public function __construct($username)
{
$_x = 'a'; // LOCAL variable, exists only in the constructor
$this->_x = 'a'; // class variable
^^^^^----you forgot this
您也必须在构造函数中使用$this关键字:
public function __construct($username)
{
$this->_x = 'a';
$this->_y = 'b';
$this->_z = 'c';
$this->_array = array( 'red' => $this->_x, 'blue' => $this->_y, 'green' => $this->_z,);
}