Php/docs/recursiveiteratoriterator.construct

• PHP Manual
• RecursiveIteratorIterator
• Construct a RecursiveIteratorIterator

RecursiveIteratorIterator::__construct

(PHP 5 >= 5.1.3, PHP 7)

RecursiveIteratorIterator::__construct — Construct a RecursiveIteratorIterator

说明

public RecursiveIteratorIterator::__construct ( Traversable $iterator [, int $mode = RecursiveIteratorIterator::LEAVES_ONLY [, int $flags = 0 ]] )

Creates a RecursiveIteratorIterator from a RecursiveIterator.

参数

iterator

The iterator being constructed from. Either a RecursiveIterator or IteratorAggregate.

mode

Optional mode. Possible values are

• RecursiveIteratorIterator::LEAVES_ONLY - The default. Lists only leaves in iteration.
• RecursiveIteratorIterator::SELF_FIRST - Lists leaves and parents in iteration with parents coming first.
• RecursiveIteratorIterator::CHILD_FIRST - Lists leaves and parents in iteration with leaves coming first.

flags

Optional flag. Possible values are RecursiveIteratorIterator::CATCH_GET_CHILD which will then ignore exceptions thrown in calls to RecursiveIteratorIterator::getChildren().

返回值

没有返回值。

范例

Example #1 Iterating a RecursiveIteratorIterator

<?php$array = array(    array(        array(            array(                'leaf-0-0-0-0',                'leaf-0-0-0-1'            ),            'leaf-0-0-0'        ),        array(            array(                'leaf-0-1-0-0',                'leaf-0-1-0-1'            ),            'leaf-0-1-0'        ),        'leaf-0-0'    ));$iterator = new RecursiveIteratorIterator(    new RecursiveArrayIterator($array),    $mode);foreach ($iterator as $key => $leaf) {    echo "$key => $leaf", PHP_EOL;}?>

Output with $mode = RecursiveIteratorIterator::LEAVES_ONLY

0 => leaf-0-0-0-0
1 => leaf-0-0-0-1
0 => leaf-0-0-0
0 => leaf-0-1-0-0
1 => leaf-0-1-0-1
0 => leaf-0-1-0
0 => leaf-0-0

Output with $mode = RecursiveIteratorIterator::SELF_FIRST

0 => Array
0 => Array
0 => Array
0 => leaf-0-0-0-0
1 => leaf-0-0-0-1
1 => leaf-0-0-0
1 => Array
0 => Array
0 => leaf-0-1-0-0
1 => leaf-0-1-0-1
1 => leaf-0-1-0
2 => leaf-0-0

Output with $mode = RecursiveIteratorIterator::CHILD_FIRST

0 => leaf-0-0-0-0
1 => leaf-0-0-0-1
0 => Array
1 => leaf-0-0-0
0 => Array
0 => leaf-0-1-0-0
1 => leaf-0-1-0-1
0 => Array
1 => leaf-0-1-0
1 => Array
2 => leaf-0-0
0 => Array