ArrayIterator::next

(PHP 5, PHP 7, PHP 8)

ArrayIterator::next — Move to next entry

说明

public ArrayIterator::next ( ) : void

The iterator to the next entry.

参数

此函数没有参数。

返回值

没有返回值。

范例

Example #1 ArrayIterator::next() example


<?php
$arrayobject = new ArrayObject();

$arrayobject[] = 'zero';
$arrayobject[] = 'one';

$iterator = $arrayobject->getIterator();

while($iterator->valid()) {
    echo $iterator->key() . ' => ' . $iterator->current() . "\n";

    $iterator->next();
}
?>

以上例程会输出：

0 => zero
1 => one

User Contributed Notes

onelsonsenna at gmail dot com 06-Oct-2011 11:09


If you use exchangeArray method of ArrayObject and then next method of ArrayIterator like this:



<?php

    

    $fruits = array("apple", "grape", "lemon");



    $colors = array("blue", "yellow", "green");



    $arrayObject = new ArrayObject($fruits);

    

    $arrayIterator = $arrayObject->getIterator();



    while($arrayIterator->valid()) {



        if ($arrayIterator->current() == "grape") {

            $arrayObject->exchangeArray($colors);

        }



        $arrayIterator->next();

    }



?>



You will receive:



PHP Notice:  ArrayIterator::next(): Array was modified outside object and internal position is no longer valid



So be careful with next and prev operations. :)