Countable::count

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

    Countable::count — 统计对象的元素个数

    说明

    public Countable::count(): int

    当在实现了 Countable 的对象上执行 count() 函数时，会执行此方法。

    参数

    此函数没有参数。

    返回值

    int 形式的自定义计数。

    注意:

    返回值强制转换为 int。

    示例

    示例 #1 Countable::count() 示例

    <?php
    class myCounter implements Countable {
    private     $count = 0;
    public function     count() {
    return ++    $this->count;
    }
    }

    $counter = new myCounter;

    for(    $i=0; $i<10; ++$i) {
    echo     "I have been count()ed " . count($counter) . " times\n";
    }
    ?>

    以上示例的输出类似于：

    I have been count()ed 1 times
I have been count()ed 2 times
I have been count()ed 3 times
I have been count()ed 4 times
I have been count()ed 5 times
I have been count()ed 6 times
I have been count()ed 7 times
I have been count()ed 8 times
I have been count()ed 9 times
I have been count()ed 10 times

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