Returns the number of objects in the storage

# SplObjectStorage::count

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplObjectStorage::count — Returns the number of objects in the storage

### 说明

public function SplObjectStorage::count(int `$mode` = `COUNT_NORMAL`): int

Counts the number of objects in the storage.

### 参数

`mode`

  If the optional `mode` parameter is set to `COUNT_RECURSIVE` (or 1), SplObjectStorage::count() will recursively count the storage.

### 返回值

The number of objects in the storage.

### 示例

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)

### 参见

- SplObjectStorage::attach() - Adds an object in the storage
- SplObjectStorage::detach() - Removes an object from the storage

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