Multidimensional ArrayObject

Question

Is there a way to implement class with multidimensional array access? I want something like

$obj = new MultiArrayObject();
$obj['key']['subkey'] = 'test';
echo $obj['key']['subkey']; //expect 'test' here

This is how the default Array behaves. What are you trying to do? — Phylogenesis
– Phylogenesis, Commented Oct 2, 2015 at 13:35
I want to implement Session class, that will put data to Redis storage and will get it from there. Just like usual $_SESSION variable, but with additional features like session_start() calls. — Dmitry Meshkov
– Dmitry Meshkov, Commented Oct 2, 2015 at 13:50
ArrayObject does exactly as you ask with multi-dimensional arrays without any extra coding. Maybe interesting? PHP ArrayAccess set multidimensional. I suspect that ArrayObject has access to a lot of the 'internal PHP array stuff' and provides it for free? — Ryan Vincent
– Ryan Vincent, Commented Oct 2, 2015 at 21:56

deceze · Accepted Answer · 2015-10-02 13:57:49Z

1

There is no syntax with which a class can intercept multiple levels of array access, but you can do it one level at a time by implementing the ArrayAccess interface:

class MultiArrayObject implements ArrayAccess {

    protected $data = [];

    public function offsetGet($offset) {
        if (!array_key_exists($offset, $this->data)) {
            $this->data[$offset] = new $this;
        }
        return $this->data[$offset];
    }

    /* the rest of the ArrayAccess methods ... */

}

This would create and return a new nested MultiArrayObject as soon as you access $obj['key'], on which you can set data.

However, this won't allow you to distinguish between setters and getters; all values will always be implicitly created as soon as you access them, which might make the behaviour of this object a little weird.

edited Oct 2, 2015 at 13:57

answered Oct 2, 2015 at 13:41

deceze♦

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2 Comments

Dmitry Meshkov Over a year ago

How to implement offsetSet() here?

deceze Over a year ago

$this->data[$offset] = $value;...!?

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