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The LimitIterator class

(PHP 5 >= 5.1.0, PHP 7)

简介

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

类摘要

LimitIterator extends IteratorIterator implements OuterIterator {

/* 方法 */

public __construct ( Iterator $iterator [, int $offset = 0 [, int $count = -1 ]] )

public current ( void ) : mixed

public getInnerIterator ( void ) : Iterator

public getPosition ( void ) : int

public key ( void ) : mixed

public next ( void ) : void

public rewind ( void ) : void

public seek ( int $position ) : int

public valid ( void ) : bool

}

范例

Example #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);
}

?>

以上例程会输出：

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

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

LimitIterator::__construct — Construct a LimitIterator
LimitIterator::current — Get current element
LimitIterator::getInnerIterator — Get inner iterator
LimitIterator::getPosition — Return the current position
LimitIterator::key — Get current key
LimitIterator::next — Move the iterator forward
LimitIterator::rewind — Rewind the iterator to the specified starting offset
LimitIterator::seek — Seek to the given position
LimitIterator::valid — Check whether the current element is valid

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The LimitIterator class

简介

类摘要

范例

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User Contributed Notes

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