RecursiveArrayIterator::getChildren

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

RecursiveArrayIterator::getChildren — Returns an iterator for the current entry if it is an array or an object

说明

public RecursiveArrayIterator::getChildren(): ?RecursiveArrayIterator

Returns an iterator for the current iterator entry.

参数

此函数没有参数。

返回值

An iterator for the current entry, if it is an array or object; or null on failure.

错误／异常

An InvalidArgumentException will be thrown if the current entry does not contain an array or an object.

示例

示例 #1 RecursiveArrayIterator::getChildren() example

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

$iterator = new RecursiveArrayIterator($fruits);

while ($iterator->valid()) {

    if ($iterator->hasChildren()) {
        // print all children
        foreach ($iterator->getChildren() as $key => $value) {
            echo $key . ' : ' . $value . "\n";
        }
    } else {
        echo "No children.\n";
    }

    $iterator->next();
}
?>

以上示例会输出：

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

参见

RecursiveArrayIterator::hasChildren() - Returns whether current entry is an array or an object

改进此页面

了解如何改进此页面 • 提交拉取请求 • 报告一个错误

＋添加备注

用户贡献的备注 1 note

down

814ckf0x ¶

10 years ago

RecursiveArrayIterator::getChildrens returns a copy of the children, not a reference:
<?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);
?>

returns: 

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" <--- expected to be changed
      }
    }
    ["some1"]=>
    string(6) "value1"
  }
}
object(RecursiveArrayIterator)#2 (1) {
  ["storage":"ArrayIterator":private]=>
  array(2) {
    ["subsome"]=>
    string(8) "subvalue"
    [0]=>
    array(1) {
      ["subsubsome"]=>
      string(11) "subsubvalue" <--- expected to be changed
    }
  }
}
object(RecursiveArrayIterator)#3 (1) {
  ["storage":"ArrayIterator":private]=>
  array(1) {
    ["subsubsome"]=>
    string(14) "subsubdiferent"
  }
}