您也可以通过DOM来实现这一点。请参阅下面的代码。

<?php

$el = array();
$command = array();

$dom = new DOMDocument('1.0', 'utf-8');
$dom->formatOutput = true;

$xml_array = [
    'root'=>[
    'Good guy' => [
        'name' => [
            '_cdata' => 'Luke Skywalker'
        ],
        'weapon' => 'Lightsaber'
    ],
    'Bad guy' => [
        'name' => 'Sauron',
        'weapon' => 'Evil Eye'
    ]
        ]
];

convert_xml($xml_array);

if(!empty($el))
{
    $dom->appendChild(end($el));
}

echo $dom->saveXML();

?>

<?php

 function convert_xml($Xml)
{
    global $el, $dom;

        foreach($Xml as $id=>$val)
        {
            if(is_numeric($id))
            {
                $id = "Item".($id);
            }

            $id = str_replace(' ', '-', strtolower($id));

            if(is_array($val))
            {
                $ele = $dom->createElement($id);
                array_push($el, $ele);
                convert_xml($val);
            }
            else
            {
                $ele = $dom->createElement($id, $val);

                if(!empty($el))
                {
                    $com = end($el)->appendChild($ele);
                }
                else
                {
                    $dom->appendChild($ele);
                }

            }
        }

        if(sizeof($el) > 1)
        {
            $child = end($el);
            $com = prev($el)->appendChild($child);
            array_pop($el);
        }
}

?>

<?php
function array_to_xml(array $arr, SimpleXMLElement $xml)
{
    foreach ($arr as $k => $v) {
        is_array($v)
            ? array_to_xml($v, $xml->addChild($k))
            : $xml->addChild($k, $v);
    }
    return $xml;
}

$test_array = array (
    'bla' => 'blub',
    'foo' => 'bar',
    'another_array' => array (
        'stack' => 'overflow',
    ),
);

echo array_to_xml($test_array, new SimpleXMLElement('<root/>'))->asXML();

我想要一个代码，将一个数组内的所有元素，并把它们作为属性，所有数组作为子元素。

对于像这样的东西

array (
'row1' => array ('head_element' =>array("prop1"=>"some value","prop2"=>array("empty"))),
"row2"=> array ("stack"=>"overflow","overflow"=>"overflow")
);

我会得到这样的结果

<?xml version="1.0" encoding="utf-8"?>
<someRoot>
  <row1>
    <head_element prop1="some value">
      <prop2 0="empty"/>
    </head_element>
  </row1>
  <row2 stack="overflow" overflow="stack"/>
 </someRoot>

要实现这一点，代码如下，但要非常小心，它是递归的，实际上可能会导致stackoverflow:)

function addElements(&$xml,$array)
{
$params=array();
foreach($array as $k=>$v)
{
    if(is_array($v))
        addElements($xml->addChild($k), $v);
    else $xml->addAttribute($k,$v);
}

}
function xml_encode($array)
{
if(!is_array($array))
    trigger_error("Type missmatch xml_encode",E_USER_ERROR);
$xml=new SimpleXMLElement('<?xml version=\'1.0\' encoding=\'utf-8\'?><'.key($array).'/>');
addElements($xml,$array[key($array)]);
return $xml->asXML();
} 

您可能希望添加数组长度检查，以便在数据部分中设置某些元素，而不是作为属性。

function array2xml(array $data, SimpleXMLElement $object = null, $oldNodeName = 'item')
{
    if (is_null($object)) $object = new SimpleXMLElement('<root/>');
    $isNumbered = true;
    $idx = 0;
    foreach ($data as $key => $x)
        if (is_string($key) || ($idx++ != $key + 0))
            $isNumbered = false;
    foreach ($data as $key => $value)
    {   
        $attribute = preg_match('/^[0-9]/', $key . '') ? $key : null;
        $key = (is_string($key) && !preg_match('/^[0-9]/', $key . '')) ? $key : preg_replace('/s$/', '', $oldNodeName);
        if (is_array($value))
        {
            $new_object = $object->addChild($key);
            if (!$isNumbered && !is_null($attribute)) $new_object->addAttribute('id', $attribute);
            array2xml($value, $new_object, $key);
        }
        else
        {
            if (is_bool($value)) $value = $value ? 'true' : 'false';
            $node = $object->addChild($key, htmlspecialchars($value));
            if (!$isNumbered && !is_null($attribute) && !isset($node->attributes()->id))
                $node->addAttribute('id', $attribute);
        }
    }
    return $object;
}

例如，该函数返回一个<obj>…</obj><obj>…</obj>数值索引的XML标记。

输入:

    array(
    'people' => array(
        'dog',
        'cat',
        'life' => array(
            'gum',
            'shoe',
        ),
        'fish',
    ),
    array('yeah'),
)

输出:

<root>
    <people>
        <people>dog</people>
        <people>cat</people>
        <life>
            <life>gum</life>
            <life>shoe</life>
        </life>
        <people>fish</people>
        <people>
            <people>yeah</people>
        </people>
    </people>
</root>

这应该能满足所有的共同需求。也许你可以把第三行改成:

$key = is_string($key) ? $key : $oldNodeName . '_' . $key;

或者如果你正在处理以s结尾的复数:

$key = is_string($key) ? $key : preg_replace('/s$/', '', $oldNodeName);

另一个改进:

/**
* Converts an array to XML
*
* @param array $array
* @param SimpleXMLElement $xml
* @param string $child_name
*
* @return SimpleXMLElement $xml
*/
public function arrayToXML($array, SimpleXMLElement $xml, $child_name)
{
    foreach ($array as $k => $v) {
        if(is_array($v)) {
            (is_int($k)) ? $this->arrayToXML($v, $xml->addChild($child_name), $v) : $this->arrayToXML($v, $xml->addChild(strtolower($k)), $child_name);
        } else {
            (is_int($k)) ? $xml->addChild($child_name, $v) : $xml->addChild(strtolower($k), $v);
        }
    }

    return $xml->asXML();
}

用法:

$this->arrayToXML($array, new SimpleXMLElement('<root/>'), 'child_name_to_replace_numeric_integers');

下面讨论名称空间。在本例中，构造包装器以包含名称空间定义，并将其传递给函数。使用冒号来标识命名空间。

测试数组

$inarray = [];
$inarray['p:apple'] = "red";
$inarray['p:pear'] = "green";
$inarray['p:peach'] = "orange";
$inarray['p1:grocers'] = ['p1:local' => "cheap", 'p1:imported' => "expensive"];


$xml = new SimpleXMLElement( '<p:wrapper xmlns:p="http://namespace.org/api" xmlns:p1="http://namespace.org/api2 /> ');

array_to_xml($xml,$inarray); 




function array_to_xml(SimpleXMLElement $object, array $data)
{   
    $nslist = $object->getDocNamespaces();

    foreach ($data as $key => $value)
    {   
        $nspace = null;
        $keyparts = explode(":",$key,2);
        if ( count($keyparts)==2) 
            $nspace = $nslist[$keyparts[0]];

        if (is_array($value))
        {   
            $key = is_numeric($key) ? "item$key" : $key;
            $new_object = $object->addChild($key,null,$nspace);
            array_to_xml($new_object, $value);
        }   
        else
        {   
            $key = is_numeric($key) ? "item$key" : $key;
            $object->addChild($key, $value,$nspace);
        }   
    }   
}