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    SimpleXMLElement::children

    (PHP 5, PHP 7, PHP 8)

    SimpleXMLElement::children — 指定したノードの子ノードを見付ける

    説明

    public SimpleXMLElement::children(?string $namespaceOrPrefix = null, bool $isPrefix = false): ?SimpleXMLElement

    このメソッドは、指定した要素の子を見つけます。 結果は、通常の反復子により取得できます。

    注意: SimpleXML では、ほとんどのメソッドに反復処理を追加するための手順が定義されています。 これらは、var_dump() やオブジェクトを評価する他の手段で 見ることはできません。

    パラメータ

    namespaceOrPrefix

    XML 名前空間。

    isPrefix

    isPrefix が true の場合は namespaceOrPrefix をプレフィックスとして扱います。false の場合は namespaceOrPrefix を名前空間 URL として扱います。

    戻り値

    ノードが子を持つかどうかにかかわらず SimpleXMLElement 要素を返します。 ノードが属性である場合は、null を返します。

    例

    例1 children() 疑似配列を走査する

    <?php
    $xml     = new SimpleXMLElement(
    '<person>
    <child role="son">
    <child role="daughter"/>
    </child>
    <child role="daughter">
    <child role="son">
    <child role="son"/>
    </child>
    </child>
    </person>'    );

    foreach (    $xml->children() as $second_gen) {
    echo     ' The person begot a ' . $second_gen['role'];

    foreach (    $second_gen->children() as $third_gen) {
    echo     ' who begot a ' . $third_gen['role'] . ';';

    foreach (    $third_gen->children() as $fourth_gen) {
    echo     ' and that ' . $third_gen['role'] .
    ' begot a ' . $fourth_gen['role'];
    }
    }
    }
    ?>

    上の例の出力は以下となります。

    The person begot a son who begot a daughter; The person
begot a daughter who begot a son; and that son begot a son

    例2 名前空間の使用

    <?php
    $xml     = '<example xmlns:foo="my.foo.urn">
    <foo:a>Apple</foo:a>
    <foo:b>Banana</foo:b>
    <c>Cherry</c>
    </example>'    ;

    $sxe = new SimpleXMLElement($xml);

    $kids = $sxe->children('foo');
    var_dump(count($kids));

    $kids = $sxe->children('foo', TRUE);
    var_dump(count($kids));

    $kids = $sxe->children('my.foo.urn');
    var_dump(count($kids));

    $kids = $sxe->children('my.foo.urn', TRUE);
    var_dump(count($kids));

    $kids = $sxe->children();
    var_dump(count($kids));
    ?>
    int(0)
int(2)
int(2)
int(0)
int(1)

    参考

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    User Contributed Notes 4 notes

    up
    13
    aero
    17 years ago
    Here's a simple, recursive, function to transform XML data into pseudo E4X syntax ie. root.child.value = foobar

    <?php
    error_reporting    (E_ALL);

    $xml = new SimpleXMLElement(
    '<Patriarch>
    <name>Bill</name>
    <wife>
    <name>Vi</name>
    </wife>
    <son>
    <name>Bill</name>
    </son>
    <daughter>
    <name>Jeri</name>
    <husband>
    <name>Mark</name>
    </husband>
    <son>
    <name>Greg</name>
    </son>
    <son>
    <name>Tim</name>
    </son>
    <son>
    <name>Mark</name>
    </son>
    <son>
    <name>Josh</name>
    <wife>
    <name>Kristine</name>
    </wife>
    <son>
    <name>Blake</name>
    </son>
    <daughter>
    <name>Liah</name>
    </daughter>
    </son>
    </daughter>
    </Patriarch>'    );

    RecurseXML($xml);

    function     RecurseXML($xml,$parent="")
    {
    $child_count = 0;
    foreach(    $xml as $key=>$value)
    {
    $child_count++;
    if(    RecurseXML($value,$parent.".".$key) == 0) // no childern, aka "leaf node"
    {
    print(    $parent . "." . (string)$key . " = " . (string)$value . "<BR>\n");
    }
    }
    return     $child_count;
    }

    ?>

    The output....

    .name = Bill
    .wife.name = Vi
    .son.name = Bill
    .daughter.name = Jeri
    .daughter.husband.name = Mark
    .daughter.son.name = Greg
    .daughter.son.name = Tim
    .daughter.son.name = Mark
    .daughter.son.name = Josh
    .daughter.son.wife.name = Kristine
    .daughter.son.son.name = Blake
    .daughter.son.daughter.name = Liah
    up
    7
    Sebastian
    19 years ago
    Just a quick addition:

    If you need to access a child node which contains a dash, you need to encapsulate it with {""}.

    For example:
    <?php
    foreach ($domain->domain-listing as $product) {
    }
    ?>

    The example above doesn't work because of the dash. But instead you need to use:
    <?php
    foreach ($domain->{"domain-listing"} as $product) {
    }
    ?>

    At least for me the second example works perfectly fine.
    up
    2
    transglobe at gmx dot de
    16 years ago
    I made a slightly differnt approch towards the RecurseXML function. Beeing hungry I had problems with the code, as it did just overwrite two <maincourse>s. So here is what I did:

    <?php

    $xml     = new SimpleXMLElement(
    '<meal>
    <type>Lunch</type>
    <time>12:30</time>
    <menu>
    <entree>salad</entree>
    <maincourse>
    <part>ships</part>
    <part>steak</part>
    </maincourse>
    <maincourse>
    <part>fisch</part>
    <part>rice</part>
    </maincourse>
    <maincourse>
    <part>wine</part>
    <part>cheese</part>
    </maincourse>
    </menu>
    </meal>'    );

    $vals = array();
    RecurseXML($xml,$vals);

    foreach(    $vals as $key=>$value)
    print(    "{$key} = {$value}<BR>\n");

    function     RecurseXML($xml,&$vals,$parent="") {

    $childs=0;
    $child_count=-1; # Not realy needed.
    $arr=array();
    foreach (    $xml->children() as $key=>$value) {
    if (    in_array($key,$arr)) {
    $child_count++;
    } else {
    $child_count=0;
    }
    $arr[]=$key;
    $k=($parent == "") ? "$key.$child_count" : "$parent.$key.$child_count";
    $childs=RecurseXML($value,$vals,$k);
    if (    $childs==0) {
    $vals[$k]= (string)$value;
    }
    }

    return     $childs;
    }

    ?>
    Output is like this:
    type.0 = Lunch
    time.0 = 12:30
    menu.0.entree.0 = salad
    menu.0.maincourse.0.part.0 = ships
    menu.0.maincourse.0.part.1 = steak
    menu.0.maincourse.0 =
    menu.0.maincourse.1.part.0 = fisch
    menu.0.maincourse.1.part.1 = rice
    menu.0.maincourse.1 =
    menu.0.maincourse.2.part.0 = wine
    menu.0.maincourse.2.part.1 = cheese
    menu.0.maincourse.2 =
    menu.0 =

    (Not beautiful, but it solved my case...)
    up
    0
    boan dot web at outlook dot com
    5 years ago
    SimpleXMLElement::children can return null in this case:

    <?php
    $xml     = '
    <root attr="Hello"/>
    '    ;

    $sxe = new SimpleXMLElement($xml);

    $sxe_xpath = $sxe->xpath('/root/@attr')[0];

    $children = $sxe_xpath->children();

    var_export($children); // Is null
    ?>
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