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

示例 #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

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User Contributed Notes 1 note

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onelsonsenna at gmail dot com ¶

10 years ago


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PHP Notice:  ArrayIterator::next(): Array was modified outside object and internal position is no longer valid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

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