Note: using count on a array object will include non filtered objects. Using iterator_count will not include filtered objects.
(PHP 5 >= 5.1.0, PHP 7)
iterator_count — 计算迭代器中元素的个数
iterator要计数的迭代器。
迭代器iterator中的元素个数。
Example #1 iterator_count() example
<?php
$iterator = new ArrayIterator(array('recipe'=>'pancakes', 'egg', 'milk', 'flour'));
var_dump(iterator_count($iterator));
?>
以上例程会输出：
int(4)
Note: using count on a array object will include non filtered objects. Using iterator_count will not include filtered objects.