PHP Conference Japan 2024

    RecursiveArrayIterator::getChildren

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

    RecursiveArrayIterator::getChildren — 如果目前項目是 陣列 或 物件，則傳回該項目的迭代器

    說明

    public RecursiveArrayIterator::getChildren(): ?RecursiveArrayIterator

    傳回目前迭代器項目的迭代器。

    參數

    此函式沒有參數。

    回傳值

    若目前的項目是一個 陣列 或 物件，則會回傳目前項目的迭代器；若失敗則回傳 null。

    錯誤／例外

    如果目前的項目不包含 陣列 或 物件，則會拋出 InvalidArgumentException。

    範例

    範例 #1 RecursiveArrayIterator::getChildren() 範例

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

    $iterator = new RecursiveArrayIterator($fruits);

    while (    $iterator->valid()) {

    if (    $iterator->hasChildren()) {
    // 顯示所有子項目
    foreach ($iterator->getChildren() as $key => $value) {
    echo     $key . ' : ' . $value . "\n";
    }
    } else {
    echo     "沒有子項目。\n";
    }

    $iterator->next();
    }
    ?>

    上述範例將輸出：

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

    參見

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    3
    814ckf0x
    10 年前
    RecursiveArrayIterator::getChildren() 回傳的是子項目的副本，而不是參考。
    <?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);
    ?>
    回傳值

    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" <--- 預期會被更改
    }
    }
    ["some1"]=>
    string(6) "value1"
    }
    }
    object(RecursiveArrayIterator)#2 (1) {
    ["storage":"ArrayIterator":private]=>
    array(2) {
    ["subsome"]=>
    string(8) "subvalue"
    [0]=>
    array(1) {
    ["subsubsome"]=>
    string(11) "subsubvalue" <--- 預期會被更改
    }
    }
    }
    object(RecursiveArrayIterator)#3 (1) {
    ["storage":"ArrayIterator":private]=>
    array(1) {
    ["subsubsome"]=>
    string(14) "subsubdiferent"
    }
    }
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