RecursiveArrayIterator::getChildren

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

    RecursiveArrayIterator::getChildren — 如果当前条目是 数组 或 对象，则返回该条目的迭代器

    描述

    public RecursiveArrayIterator::getChildren(): ?RecursiveArrayIterator

    返回当前迭代器条目的迭代器。

    参数

    此函数没有参数。

    返回值

    当前条目的迭代器，如果它是一个 数组 或 对象；或者在失败时为 null。

    错误/异常

    如果当前条目不包含 数组 或 对象，将抛出 InvalidArgumentException。

    示例

    示例 #1 RecursiveArrayIterator::getChildren() 示例

    <?php
    $fruits     = array("a" => "lemon", "b" => "orange", array("a" => "apple", "p" => "pear"));

    $iterator = new RecursiveArrayIterator($fruits);

    while (    $iterator->valid()) {

    if (    $iterator->hasChildren()) {
    // 打印所有子项
    foreach ($iterator->getChildren() as $key => $value) {
    echo     $key . ' : ' . $value . "\n";
    }
    } else {
    echo     "没有子项。\n";
    }

    $iterator->next();
    }
    ?>

    上面的示例将输出

    No children.
No children.
a : apple
p : pear

    参见

    改进此页面

    了解如何改进此页面 • 提交拉取请求 • 报告错误
    ＋添加笔记

    用户贡献笔记 1 个笔记

    3
    814ckf0x
    10 年前
    RecursiveArrayIterator::getChildrens 返回子项的副本，而不是引用
    <?php
    $stack     = array ("some" => "value",
    array (    "subsome" => "subvalue", array ("subsubsome" => "subsubvalue")),
    "some1" => "value1");

    $object = new RecursiveArrayIterator ($stack);
    $object->next ();
    $second_object = &$object->getChildren ();

    $second_object->next ();

    $third_object = &$second_object->getChildren ();

    $third_object->offsetSet ("subsubsome", "subsubdiferent");

    var_dump ($object);
    var_dump ($second_object);
    var_dump ($third_object);
    ?>

    返回

    object(RecursiveArrayIterator)#1 (1) {
    ["storage":"ArrayIterator":private]=>
    array(3) {
    ["some"]=>
    string(5) "value"
    [0]=>
    array(2) {
    ["subsome"]=>
    string(8) "subvalue"
    [0]=>
    array(1) {
    ["subsubsome"]=>
    string(11) "subsubvalue" <--- 预计会改变
    }
    }
    ["some1"]=>
    string(6) "value1"
    }
    }
    object(RecursiveArrayIterator)#2 (1) {
    ["storage":"ArrayIterator":private]=>
    array(2) {
    ["subsome"]=>
    string(8) "subvalue"
    [0]=>
    array(1) {
    ["subsubsome"]=>
    string(11) "subsubvalue" <--- 预计会改变
    }
    }
    }
    object(RecursiveArrayIterator)#3 (1) {
    ["storage":"ArrayIterator":private]=>
    array(1) {
    ["subsubsome"]=>
    string(14) "subsubdiferent"
    }
    }
    ＋添加笔记
    To Top