LimitIterator::__construct

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

LimitIterator::__constructConstruct 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.

范例

示例 #1 LimitIterator::__construct() example

<?php
$ait 
= new ArrayIterator(array('a''b''c''d''e'));
$lit = new LimitIterator($ait13);
foreach (
$lit as $value) {
    echo 
$value "\n";
}
?>

以上例程会输出:

b
c
d

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