SplObjectStorage::attach

(PHP 5 >= 5.1.0, PHP 7)

Adds an object in the storage

public void SplObjectStorage::attach ( object $object [, mixed $data = NULL ] )

Adds an object inside the storage, and optionally associate it to some data.

Parameters:

object

The object to add.

data

The data to associate with the object.

Returns:

No value is returned.

Changelog:

5.3.0

Added the data parameter.

Examples:

SplObjectStorage::attach() example

<?php
$o1 = new StdClass;
$o2 = new StdClass;
$s = new SplObjectStorage();
$s->attach($o1); // similar to $s[$o1] = NULL;
$s->attach($o2, "hello"); // similar to $s[$o2] = "hello";
 
var_dump($s[$o1]);
var_dump($s[$o2]);
 
?>

The above example will output something similar to:

NULL
string(5) "hello"