SplObjectStorage::offsetSet

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SplObjectStorage::offsetSet — Associates data to an object in the storage

Description

public SplObjectStorage::offsetSet(object $object, mixed $info = null): void

Associate data to an object in the storage.

Note:
SplObjectStorage::offsetSet() is an alias of SplObjectStorage::attach().

Parameters

object: The object to associate data with.
info: The data to associate with the object.

Return Values

No value is returned.

Examples

Example #1 SplObjectStorage::offsetSet() example

<?php
$s = new SplObjectStorage;

$o1 = new stdClass;

$s->offsetSet($o1, "hello"); // Similar to $s[$o1] = "hello";

var_dump($s[$o1]);
?>

The above example will output something similar to:

string(5) "hello"

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User Contributed Notes 1 note

down

aderh ¶

1 year ago

Although `offsetSet` is supposed to be an alias to `attach`, real-world results do not indicate that. When extending the SplObjectStorage class, it's expected that a modification to `attach` would also affect `offsetSet`. However, it seems they need to both be extended. Consider the results below...

<?php

declare(strict_types=1);

class CustomSplObjectStorage extends SplObjectStorage
{
    public function offsetSet(mixed $object, mixed $info = null): void
    {
        print("offsetSet called\n");
        parent::offsetSet($object, $info);
    }

    public function attach(mixed $object, mixed $info = null): void
    {
        print("attach called\n");
        parent::attach($object, $info);
    }
}

$a = new CustomSplObjectStorage();
$a[new stdClass()] = 'ok';
$a->attach(new stdClass(), 'ok');
?>

This prints:
```
offsetSet called
attach called
```

While we would expect...

```
offsetSet called
attach called
attach called
```

... if `offsetSet` was a true alias of `attach`. I'm not sure if this is intentional or not.