ArrayIterator::next()

(PHP 5,PHP 7)

Move to next entry

说明

publicArrayIterator::next(void) : 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#1ArrayIterator::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

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PHP Notice: ArrayIterator::next(): Array was modified outside object and internal position is no longer valid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