Alrighty, I'm getting quite frustrated, namely because I thought I had this issue solved, or had accomplished this successfully before.
Quick preliminary:
-1
actually; future safe, all errors/notices)I have a class, it aggregates request parameters. For giggles here is a stripped down version:
class My_Request{
private $_data = array();
public function __construct(Array $params, Array $session){
$this->_data['params'] = $params;
$this->_data['session'] = $session;
}
public function &__get($key){
// arrg!
}
}
Anyways, the reason for arrg!
is, no matter what I try, I always get an error whenever the $key
doesn't exist. I've tried:
// doesn't work
$null = null;
if(isset($this->_data[$key])){ return $this->_data[$key]; }
return $null;
// doesn't work
return $this->_data[$key];
I've been told ternary operators cannot result in a reference, ergo, that of course doesn't work, but we know that from the if
condition attempt anyways. What happens, for example:
// params will have foo => bar, and session hello => world
$myRequest = new My_Request(array('foo' => 'bar'), array('hello' => 'world'));
// throws an error - Undefined index: baz
echo $myRequest->params['baz'];
I'm losing my mind here; perhaps I hallucinated a scenario where I achieved this. Is it not possible to (without throwing a notice) successfully do this?
Clarification: Things I've tried
The aforementioned:
// no check, no anything, just try returning : fails
public function &__get($key){
return $this->_data[$key];
}
// null variable to pass back by reference : fails
public function &__get($key){
$null = null;
if(isset($this->_data[$key])){
return $this->_data[$key];
}
return $null;
}
Other attempts:
// can't work - can't return null by reference nor via ternary : fails
public function &__get($key){
return isset($this->_data[$key])
? $this->_data[$key]
: null;
}
echo $myRequest->params['baz'];
The isset check in your __get
function will look up "params"
from $this->_data
and return the array. The notice you get is from outside the class and about a key "baz"
in the returned array - which in your example was never actually defined.