Php/docs/countable.count

• PHP Manual
• Countable
• 统计一个对象的元素个数

Countable::count

(PHP 5 >= 5.1.0, PHP 7)

Countable::count — 统计一个对象的元素个数

说明

abstract public Countable::count ( ) : int

当使用 count()函数作用于一个实现了 Countable的对象时这个方法会被执行.

参数

此函数没有参数。

返回值

The custom count as an integer.

Note:

The return value is cast to an integer.

范例

Example #1 Countable::count() example

<?phpclass myCounter implements Countable {    public function count() {        static $count = 0;        return ++$count;    }}$counter = new myCounter;for($i=0; $i<10; ++$i) {    echo "I have been count()ed " . count($counter) . " times\n";}?>

以上例程的输出类似于：

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