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

isPrefixtrue 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

add a note

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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