Use list() with an object in PHP

Question

I would like to use the list() statement in combination with an object.

$tuple = new Tuple();
// ..
list ($guestbook, $entry, $author) = $tuple;

This would work if $tuple was an array with three elements. But its an object.

Is there any way without using a method of Tuple (returning that kind of array) like implementing a fancy native interface I yet don't know?

maybe if the object implemented an Iterator, but never tried list() with that, so no idea. — Marc B, Jul 13 '16 at 16:05
You need to get in the habit of [accepting answers](http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work) which help you to solve your issues. You'll earn points and others will be encouraged to help you. — Jay Blanchard, Jul 13 '16 at 16:33
@JayBlanchard I will accept answers when I feel they are right. The given solutions are not very elegant, they "just" solve the technical problem which wasn't my question (I know how to convert an object into an array) - I am more curious about ideas behind this (casting objects, less dependencies) — MonkeyMonkey, Jul 13 '16 at 18:35

score 1 · Answer 1 · edited May 23 '17 at 11:44

1

See this previous post: Convert PHP object to associative array

I am assuming (I haven't tested it) you could then do:

$tuple = new Tuple(); list ($guestbook, $entry, $author) = (array) $tuple;

edited May 23 '17 at 11:44

Community

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1

answered Jul 13 '16 at 16:06

James Emmrich

51
5

if this works, then it depends on the property order which I can't guarantee – MonkeyMonkey Jul 13 '16 at 18:25

score 1 · Accepted Answer · answered Jul 13 '16 at 16:08

You can implement the interface ArrayAccess to do so:

class Tuple implements ArrayAccess {
  private $arr;

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

  public function offsetExists($offset) {
    return array_key_exists($offset, $this->arr);
  }

  public function offsetGet($offset) {
    return $this->arr[$offset];
  }

  public function offsetSet($offset, $value) {
    return $this->arr[$offset] = $value;
  }

  public function offsetUnset($offset) {
    unset($this->arr[$offset]);
  }
}

$tuple = new Tuple([1, 2, 3]);

list($am, $stram, $gram) = $tuple;

echo $am;
echo $stram;
echo $gram;

// outputs: 123

Im a lazy programmer, so implementing four methods is not what I want - even though its a solution based on what I asked (but not really meant) — MonkeyMonkey, Jul 13 '16 at 18:27

score -1 · Answer 3 · answered Jul 13 '16 at 16:20

-1

You can do this:

$tumple = new Tumple();
$properties = get_object_vars($tumple);// ["guestbook" => "Feel", "entry" => "Good", "author" => "Inc"];

answered Jul 13 '16 at 16:20

Alfredo EM

2,029
1
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Use list() with an object in PHP

3 Answers3