PHP 8.4.0 RC4 available for testing

SimpleXMLElement::children

(PHP 5, PHP 7, PHP 8)

SimpleXMLElement::childrenFinds children of given node

说明

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

This method finds the children of an element. The result follows normal iteration rules.

注意: SimpleXML 建起了一个给大多数方法添加迭代属性的规则。不能通过使用 var_dump() 或任何可检查对象的其它东西来查看。

参数

namespaceOrPrefix

An XML namespace.

isPrefix

If isPrefix is true, namespaceOrPrefix will be regarded as a prefix. If false, namespaceOrPrefix will be regarded as a namespace URL.

返回值

Returns a SimpleXMLElement element, whether the node has children or not, unless the node represents an attribute, in which case null is returned.

示例

示例 #1 Traversing a children() pseudo-array

<?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'];
}
}
}
?>

以上示例会输出:

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

示例 #2 Using namespaces

<?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)

参见

添加备注

用户贡献的备注 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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