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|null

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.

范例

Example #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();
}
?>

以上例程会输出：

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

参见

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

User Contributed Notes

814ckf0x 05-Mar-2014 08:44


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"

  }

}