Класс NoRewindIterator

(PHP 5 >= 5.1.0, PHP 7)

Введение

Итератор игнорирует операции перемотки. Это позволяет обрабатывать итератор в нескольких частичных циклах foreach.

Обзор классов

NoRewindIterator extends IteratorIterator {
/* Методы */
public __construct ( Iterator $iterator )
public current ( void ) : mixed
public getInnerIterator ( void ) : iterator
public key ( void ) : mixed
public next ( void ) : void
public rewind ( void ) : void
public valid ( void ) : bool
/* Наследуемые методы */
public IteratorIterator::current ( void ) : mixed
public IteratorIterator::key ( void ) : mixed
public IteratorIterator::next ( void ) : void
public IteratorIterator::rewind ( void ) : void
public IteratorIterator::valid ( void ) : bool
}

Содержание

add a note add a note

User Contributed Notes 1 note

up
1
Anonymous
5 months ago
As its name implies, NoRewindIterator doesn't invoke the "rewind" method when It reaches the end of the iterator.

Let's demonstrate it by two examles.

In this example the "rewind" method will be invoked after when the "foreache" reaches its end, so, we can repeat printing the same values as many times as we want:

<?PHP
$iterator
= new ArrayIterator(['PHP', 'Python', 'Go']);

foreach (
$iterator as $item) {
    echo
$item.PHP_EOL;
}

foreach (
$iterator as $item) {
    echo
$item.PHP_EOL;
}
?>

By using the NoRewindIterator, the "rewind" won't be invoked, so, we can't do as we did in previous example:

<?PHP
$iterator
= new ArrayIterator(['PHP', 'Python', 'Go']);
$iterator = new NoRewindIterator($iterator);

foreach (
$iterator as $item) {
    echo
$item.PHP_EOL;
}

// doesn't do anything
foreach ($iterator as $item) {
    echo
$item.PHP_EOL;
}

?>
To Top