RecursiveArrayIterator::hasChildren

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

    RecursiveArrayIterator::hasChildren — Returns whether current entry is an array or an object

    Beschreibung

    public RecursiveArrayIterator::hasChildren(): bool

    Returns whether current entry is an array or an object for which an iterator can be obtained via RecursiveArrayIterator::getChildren().

    Parameter-Liste

    Diese Funktion besitzt keine Parameter.

    Rückgabewerte

    Returns true if the current entry is an array or an object, otherwise false is returned.

    Beispiele

    Beispiel #1 RecursiveArrayIterator::hasChildren() example

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

    $iterator = new RecursiveArrayIterator($fruits);

    while (    $iterator->valid()) {

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

    $iterator->next();
    }
    ?>

    Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

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

    Siehe auch

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    User Contributed Notes 1 note

    up
    1
    Dominik
    9 years ago
    hasChildren() works as documented here, but not as its name suggests.

    The method does not return whether the current entry actually *has* children. It only returns whether the element's type is one that is able to have children.

    This is a bit counterintuitive if you are processing empty arrays.

    Example:

    <?php
    $data     = array(
    "element one" => array(true),
    "element two" => array(),
    "element three" => array(true),
    );

    $i = new RecursiveIteratorIterator(new RecursiveArrayIterator($data),RecursiveIteratorIterator::SELF_FIRST);

    foreach(    $i as $key => $value)
    {
    $type = gettype($value);
    $depth = $i->getDepth();

    if(    $i->hasChildren()) {
    echo     "$depth: $key ($type) has children\n";
    } else {
    echo     "$depth: $key ($type) has no children\n";
    }
    }
    ?>

    Result:

    0: element one (array) has children
    1: 0 (boolean) has no children
    0: element two (array) has children
    0: element three (array) has children
    1: 0 (boolean) has no children
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