PHP Manual: Count the elements in an iterator

Description

int iterator_count(Traversablearray $iterator)

Count the elements in an iterator. iterator_count is not guaranteed to retain the current position of the iterator.

Parameters

iterator: The iterator being counted.

Return Values

The number of elements in iterator.

Changelog

Version	Description
8.2.0	The type of `iterator` has been widened from Traversable to Traversablearray.

Examples

Example #1 iterator_count example

<?php
$iterator = new ArrayIterator(array('recipe'=>'pancakes', 'egg', 'milk', 'flour'));
var_dump(iterator_count($iterator));
?>

The above example will output:

int(4)

Example #2 iterator_count modifies position

<?php
$iterator = new ArrayIterator(['one', 'two', 'three']);
var_dump($iterator->current());
var_dump(iterator_count($iterator));
var_dump($iterator->current());
?>

The above example will output:

string(3) "one"
int(3)
NULL

Example #3 iterator_count in foreach loops

<?php
$iterator = new ArrayIterator(['one', 'two', 'three']);
foreach ($iterator as $key => $value) {
    echo "$key: $value (", iterator_count($iterator), ")\n";
}?>

The above example will output:

0: one (3)