Countable::count

Count elements of an object

説明

public int Countable::count()

This method is executed when the value for count is an object implementing Countable.

パラメータ

この関数にはパラメータはありません。

戻り値

The custom count as an int.

例

例1 Countable::count example

<?php

class Counter implements Countable
{
    private $count = 0;

    public function count(): int
    {
        return ++$this->count;
    }
}

$counter = new Counter;

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

?>

上の例の出力は、たとえば以下のようになります。

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