LimitIterator::__construct

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

LimitIterator::__construct — Construct a LimitIterator

说明

public LimitIterator::__construct(Iterator $iterator, int $offset = 0, int $limit = -1)

Constructs a new LimitIterator from an iterator with a given starting offset and maximum limit.

参数

iterator

The Iterator to limit.

offset

Optional offset of the limit.

limit

Optional count of the limit.

错误／异常

Throws a ValueError if the offset is less than 0 or the limit is less than -1.

更新日志

版本 说明
8.0.0 Now throws a ValueError if offset is less than 0; previously it threw a RuntimeException.
8.0.0 Now throws a ValueError if limit is less than -1; previously it threw a RuntimeException.

示例

示例 #1 LimitIterator::__construct() example

<?php
$ait = new ArrayIterator(array('a', 'b', 'c', 'd', 'e'));
$lit = new LimitIterator($ait, 1, 3);
foreach ($lit as $value) {
echo $value . "\n";
}
?>

以上示例会输出：

b
c
d