(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplObjectStorage::attach — Adds an object in the storage
Adds an object inside the storage, and optionally associate it to some data.
objectThe object to add.
infoThe data to associate with the object.
没有返回值。
示例 #1 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]);
?>以上示例的输出类似于：
NULL string(5) "hello"