The RecursiveIterator interface
(PHP 5 >= 5.1.0)
Introduction
Classes implementing RecursiveIterator can be used to iterate over iterators recursively.
Interface synopsis
Table of Contents
- RecursiveIterator::getChildren — Returns an iterator for the current entry.
- RecursiveIterator::hasChildren — Returns if an iterator can be created fot the current entry.
Коментарии
RecursiveIterator example:
<?php
class MyRecursiveIterator implements RecursiveIterator
{
private $_data;
private $_position = 0;
public function __construct(array $data) {
$this->_data = $data;
}
public function valid() {
return isset($this->_data[$this->_position]);
}
public function hasChildren() {
return is_array($this->_data[$this->_position]);
}
public function next() {
$this->_position++;
}
public function current() {
return $this->_data[$this->_position];
}
public function getChildren() {
echo '<pre>';
print_r($this->_data[$this->_position]);
echo '</pre>';
}
public function rewind() {
$this->_position = 0;
}
public function key() {
return $this->_position;
}
}
$arr = array(0, 1, 2, 3, 4, 5 => array(10, 20, 30), 6, 7, 8, 9 => array(1, 2, 3));
$mri = new MyRecursiveIterator($arr);
foreach ($mri as $c => $v) {
if ($mri->hasChildren()) {
echo "$c has children: <br />";
$mri->getChildren();
} else {
echo "$v <br />";
}
}
?>
Result:
0
1
2
3
4
5 has children:
Array
(
[0] => 10
[1] => 20
[2] => 30
)
6
7
8
9 has children:
Array
(
[0] => 1
[1] => 2
[2] => 3
)
Note that MyRecursiveIterator does not implement the correct return type for getChildren. Which is why the example code doesn't make much sense.