LimitIterator 类

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

简介

LimitIterator 类允许遍历一个 Iterator 的限定子集的元素。

类摘要

class LimitIterator extends IteratorIterator {
/* 方法 */
public __construct(Iterator $iterator, int $offset = 0, int $limit = -1)
public current(): mixed
public getPosition(): int
public key(): mixed
public next(): void
public rewind(): void
public seek(int $offset): int
public valid(): bool
/* 继承的方法 */
public IteratorIterator::current(): mixed
public IteratorIterator::getInnerIterator(): ?Iterator
public IteratorIterator::key(): mixed
public IteratorIterator::next(): void
public IteratorIterator::rewind(): void
public IteratorIterator::valid(): bool
}

示例

示例 #1 LimitIterator usage example

<?php

// Create an iterator to be limited
$fruits = new ArrayIterator(array(
'apple',
'banana',
'cherry',
'damson',
'elderberry'
));

// Loop over first three fruits only
foreach (new LimitIterator($fruits, 0, 3) as $fruit) {
var_dump($fruit);
}

echo "\n";

// Loop from third fruit until the end
// Note: offset starts from zero for apple
foreach (new LimitIterator($fruits, 2) as $fruit) {
var_dump($fruit);
}

?>

以上示例会输出：

string(5) "apple"
string(6) "banana"
string(6) "cherry"

string(6) "cherry"
string(6) "damson"
string(10) "elderberry"

目录