php magic method __set

I'm trying to set an ambiguous variable on a class. Something along these lines:

<?php
  class MyClass {
    public $values;

    function __get($key){
      return $this->values[$key];
    }开发者_运维知识库

    function __set($key, $value){
      $this->values[$key]=$value;
    }
  }

  $user= new  MyClass();
  $myvar = "Foo";
  $user[$myvar] = "Bar"; 
?>

Is there a way of doing this?

As has been stated $instance->$property (or $instance->{$property} to make it jump out)

If you really want to access it as an array index, implement the ArrayAccess interface and use offsetGet(), offsetSet(), etc.

class MyClass implements ArrayAccess{
    private $_data = array();
    public function offsetGet($key){
        return $this->_data[$key];
    }
    public function offsetSet($key, $value){
        $this->_data[$key] = $value;
    }
    // other required methods
}

$obj = new MyClass;
$obj['foo'] = 'bar';

echo $obj['foo']; // bar

Caveat: You cannot declare offsetGet to return by reference. __get(), however, can be which permits nested array element access of the $_data property, for both reading and writing.

class MyClass{
    private $_data = array();
    public function &__get($key){
        return $this->_data[$key];
    }
}

$obj = new MyClass;
$obj->foo['bar']['baz'] = 'hello world';

echo $obj->foo['bar']['baz']; // hello world

print_r($obj);

/* dumps
MyClass Object
(
    [_data:MyClass:private] => Array
        (
            [foo] => Array
                (
                    [bar] => Array
                        (
                            [baz] => hello world
                        )

                )

        )

)

Like so: http://ideone.com/gYftr

You'd use:

$instance->$dynamicName

You access member variables with the -> operator.

$user->$myvar = "Bar";