Finds children of given node

# SimpleXMLElement::children

(PHP 5, PHP 7, PHP 8)

SimpleXMLElement::children — Finds children of given node

### 说明

public function 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

- SimpleXMLElement::count() - Counts the children of an element
- count() - 统计数组、Countable 对象中所有元素的数量

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