CakeFest 2024: The Official CakePHP Conference

Класс IteratorIterator

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

Введение

Этот итератор-обёртка позволяет преобразовывать все, что является "обходимым" (Traversable) в итератор. Важно понимать, что большинство классов, которые не реализуют итераторы, имеют на то причины, так как, скорее всего, они не позволяют реализовать полный набор возможностей итератора. Если так, то должны быть предприняты меры для предотвращения неправильного использования, иначе можно ожидать исключений или фатальных ошибок.

Обзор классов

class IteratorIterator implements OuterIterator {
/* Методы */
public __construct(Traversable $iterator, ?string $class = null)
public current(): mixed
public key(): mixed
public next(): void
public rewind(): void
public valid(): bool
}

Примечания

Замечание:

Этот класс разрешает доступ к методам внутреннего итератора через магический метод __call.

Содержание

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User Contributed Notes 4 notes

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25
sven at rtbg dot de
8 years ago
This iterator basically is only a wrapper around another iterator. It does nothing fancy, it simply forwards any calls of rewind(), next(), valid(), current() and key() to the inner iterator. This inner iterator can be fetched with getInnerIterator().

One special case: When passing an IteratorAggregate object, the getIterator() method of that object will be called and THAT iterator will be iterated over, and this will also be returned when calling getInnerIterator().

This class can be extended, so it's an ideal building block for your own classes that only want to modify one or two of the iterator methods, but not all.

Want to trim the strings returned by the current() method?

<?php

class TrimIterator extends IteratorIterator
{
public function
current() {
return
trim(parent::current());
}
}

$innerIterator = new ArrayIterator(array('normal', ' trimmable '));

$trim = new TrimIterator($innerIterator);

foreach (
$trim as $key => $value) {
echo
"Key:\n";
var_dump($key);
echo
"Value:\n";
var_dump($value);
echo
"---next---";
}
?>

Output:

Key:
int(0)
Value:
string(6) "normal"
---next---Key:
int(1)
Value:
string(9) "trimmable"
---next---
up
1
max-p at max-p dot me
8 years ago
Little note for anyone that wants to emulate the behavior of foreach as close as possible in order to work with somewhat picky Traversable objects, without using foreach:

- Before starting the iteration, rewind() is called.
- For every iteration, the following methods are called on the iterator:
- valid()
- current()
- key()
- next()

Sounds like a silly thing to do put this way, but in my use case I needed to convert a Traversable database result cursor into a procedural-style cursor (hasNext + fetchArray) for backward compatibility, and the driver required every function to be called in the appropriate order.
up
2
thomas at gielfeldt dot dk
6 years ago
IteratorIterator::current() does not invoke the inner iterator's current() method.

The inner iterator's current() method is invoked (and cached) on rewind() and next(). The same goes for key() and valid().

Example:
<?php

$i
= new ArrayIterator(range(1,10));
$i = new IteratorIterator($i);
iterator_to_array($i); // Seek to the end
print "Valid: " . $i->valid() . "\n";
$i->append('test');
print
"Valid: " . $i->valid() . "\n";
print
"Current: " . $i->current() . "\n";

?>

Output:

Valid:
Valid:
Current:

Whereas:
<?php

$i
= new ArrayIterator(range(1,10));
iterator_to_array($i); // Seek to the end
print "Valid: " . $i->valid() . "\n";
$i->append('test');
print
"Valid: " . $i->valid() . "\n";
print
"Current: " . $i->current() . "\n";
?>

Output:

Valid:
Valid: 1
Current: test

The reason being the way current(), key() and valid() are invoked by the IteratorIterator as mentioned above.
up
1
wallacemaxters at gmail dot lcom
8 years ago
Another example of the efficiency for IteratorIterator is a small class for enumerate for iterations of an interator implementation.

Example:

<?php

class Enumerator extends IteratorIterator
{
/**
* Initial value for enumerator
* @param int
*/
protected $start = 0;

/**
* @param int
*/
protected $key = 0;

/**
* @param Traversable $iterator
* @param scalar $start
*/
public function __construct(Traversable $iterator, $start = 0)
{
parent::__construct($iterator);

$this->start = $start;

$this->key = $this->start;
}

public function
key()var_dump
{
return
$this->key;
}

public function
next()
{
++
$this->key;

parent::next();
}

public function
rewind()
{
$this->key = $this->start;

parent::rewind();
}

}
?>

This produces:

<?php

$enumerator
= new Enumerator(
new
ArrayIterator(['php', 'java', 'python']); 7000
);

print_r(iterator_to_array($enumerator));

/*
* array(3) {
7000 => 'php',
7001 => 'java',
7002 => 'python'
}
*/

?>
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