iterator_count

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

iterator_count — Count the elements in an iterator

Descrizione

iterator_count(Traversable|array $iterator): int

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

Elenco dei parametri

iterator: The iterator being counted.

Valori restituiti

The number of elements in iterator.

Log delle modifiche

Versione	Descrizione
8.2.0	The type of `iterator` has been widened from Traversable to Traversable\|array.

Esempi

Example #1 iterator_count() example

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

Il precedente esempio visualizzerà:

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());
?>

Il precedente esempio visualizzerà:

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";
}?>

Il precedente esempio visualizzerà:

0: one (3)