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(PHP 5 >= 5.1.0, PHP 7, PHP 8)
Countable::count — 统计对象的元素个数
此函数没有参数。
int 形式的自定义计数。
注意:
返回值强制转换为 int。
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
