(PHP 5 >= 5.1.0, PHP 7, PHP 8)
SplObjectStorage::count — Returns the number of objects in the storage
$mode = COUNT_NORMAL): intCounts the number of objects in the storage.
mode
If the optional mode parameter is set to
COUNT_RECURSIVE (or 1), SplObjectStorage::count()
will recursively count the storage.
The number of objects in the storage.
示例 #1 SplObjectStorage::count() example
<?php
$s = new SplObjectStorage();
$o1 = new stdClass;
$o2 = new stdClass;
$s->attach($o1);
$s->attach($o2);
$s->attach($o1);
var_dump($s->count());
var_dump(count($s));
?>以上示例的输出类似于：
int(2) int(2)