(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplObjectStorage::offsetGet — Returns the data associated with an object
Returns the data associated with an object in the storage.
The data previously associated with the object in the storage.
Throws UnexpectedValueException when object could not be found.
示例 #1 SplObjectStorage::offsetGet() example
<?php
$s = new SplObjectStorage;
$o1 = new stdClass;
$o2 = new stdClass;
$s[$o1] = "hello";
$s->attach($o2);
var_dump($s->offsetGet($o1)); // Similar to $s[$o1]
var_dump($s->offsetGet($o2)); // Similar to $s[$o2]
?>以上示例的输出类似于：
string(5) "hello" NULL