PHP-合并两个不重复的xml属性

我有两个这样的XML xml1：

巨变
N
N
2012-04-01
2013-04-01
2012-04-01

xml2：

巨变
N
N
Y
2012-04-01
2013-04-01
2012-04-01

我想合并xml1和xml2，并像这样输出

<Title>Sea Change</Title>
    <thirdParty_ID></thirdParty_ID>
    <Animation_Indicator>N</Animation_Indicator>
    <Blackout_Indicator>N</Blackout_Indicator>
<SD_Purchase_Zoe>Y</SD_Purchase_Zoe>
    <SD_Purchase_Window_Start_Zoe>2012-04-01</SD_Purchase_Window_Start_Zoe>
    <SD_Purchase_Window_End_Zoe>2013-04-01</SD_Purchase_Window_End_Zoe>
    <SD_Licensing_Window_start_Zoe>2012-04-01</SD_Licensing_Window_start_Zoe>
    <SD_Licensing_Window_start_Zoe></SD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_start_Zoe>2012-04-01</HD_Licensing_Window_start_Zoe>
    <HD_Licensing_Window_end_Zoe>2013-04-01</HD_Licensing_Window_end_Zoe>
    <HD_Purchase_Window_Start_Zoe>2012-04-01</HD_Purchase_Window_Start_Zoe>

巨变
N
N
Y
2012-04-01
2013-04-01
2012-04-01
2012-04-01
2013-04-01
2012-04-01

首先，我需要检查这两个XML是否具有相同的标题，如果它们具有相同的标题，则合并它们，如果可以从其中任何一个中找到，则合并所有值

---

谢谢你的回复。

我写了这样的话：

$x1 = <<<XML
<xml>
<Title>Sea Change</Title>
<thirdParty_ID></thirdParty_ID>
<Animation_Indicator>N</Animation_Indicator>
<Blackout_Indicator>N</Blackout_Indicator>
<SD_Purchase_Zoe></SD_Purchase_Zoe>
<SD_Purchase_Window_Start_Zoe></SD_Purchase_Window_Start_Zoe>
<SD_Purchase_Window_End_Zoe></SD_Purchase_Window_End_Zoe>
<SD_Licensing_Window_start_Zoe></SD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_start_Zoe>2012-04-01</HD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_end_Zoe>2013-04-01</HD_Licensing_Window_end_Zoe>
<HD_Purchase_Window_Start_Zoe>2012-04-01</HD_Purchase_Window_Start_Zoe>
</xml>
XML;

$x2 = <<<XML
<xml>
<Title>Sea Change</Title>
<thirdParty_ID></thirdParty_ID>
<Animation_Indicator>N</Animation_Indicator>
<Blackout_Indicator>N</Blackout_Indicator>
<SD_Purchase_Zoe>Y</SD_Purchase_Zoe>
<SD_Purchase_Window_Start_Zoe>2012-04-01</SD_Purchase_Window_Start_Zoe>
<SD_Purchase_Window_End_Zoe>2013-04-01</SD_Purchase_Window_End_Zoe>
<SD_Licensing_Window_start_Zoe>2012-04-01</SD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_start_Zoe></HD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_end_Zoe></HD_Licensing_Window_end_Zoe>
<HD_Purchase_Window_Start_Zoe></HD_Purchase_Window_Start_Zoe>
</xml>
XML;

$oXML1 = new SimpleXMLElement($x1);
$oXML2 = new SimpleXMLElement($x2);

$oOutput = new SimpleXMLElement('<xml></xml>');

foreach ( $oXML1 as $key => $value )
{
    if ( empty($value[0]) )
        $oOutput->addChild($key, $oXML2->{$key}[0]);
    else
        $oOutput->addChild($key, $value[0]);
}

print_r($oOutput->asXML());

$x1=addChild（$key，$value[0]）；
}
打印（$oOutput->asXML（））；

<Title>Sea Change</Title>
    <thirdParty_ID></thirdParty_ID>
    <Animation_Indicator>N</Animation_Indicator>
    <Blackout_Indicator>N</Blackout_Indicator>
<SD_Purchase_Zoe>Y</SD_Purchase_Zoe>
    <SD_Purchase_Window_Start_Zoe>2012-04-01</SD_Purchase_Window_Start_Zoe>
    <SD_Purchase_Window_End_Zoe>2013-04-01</SD_Purchase_Window_End_Zoe>
    <SD_Licensing_Window_start_Zoe>2012-04-01</SD_Licensing_Window_start_Zoe>
    <SD_Licensing_Window_start_Zoe></SD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_start_Zoe>2012-04-01</HD_Licensing_Window_start_Zoe>
    <HD_Licensing_Window_end_Zoe>2013-04-01</HD_Licensing_Window_end_Zoe>
    <HD_Purchase_Window_Start_Zoe>2012-04-01</HD_Purchase_Window_Start_Zoe>

$x1 = <<<XML
<xml>
<Title>Sea Change</Title>
<thirdParty_ID></thirdParty_ID>
<Animation_Indicator>N</Animation_Indicator>
<Blackout_Indicator>N</Blackout_Indicator>
<SD_Purchase_Zoe></SD_Purchase_Zoe>
<SD_Purchase_Window_Start_Zoe></SD_Purchase_Window_Start_Zoe>
<SD_Purchase_Window_End_Zoe></SD_Purchase_Window_End_Zoe>
<SD_Licensing_Window_start_Zoe></SD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_start_Zoe>2012-04-01</HD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_end_Zoe>2013-04-01</HD_Licensing_Window_end_Zoe>
<HD_Purchase_Window_Start_Zoe>2012-04-01</HD_Purchase_Window_Start_Zoe>
</xml>
XML;

$x2 = <<<XML
<xml>
<Title>Sea Change</Title>
<thirdParty_ID></thirdParty_ID>
<Animation_Indicator>N</Animation_Indicator>
<Blackout_Indicator>N</Blackout_Indicator>
<SD_Purchase_Zoe>Y</SD_Purchase_Zoe>
<SD_Purchase_Window_Start_Zoe>2012-04-01</SD_Purchase_Window_Start_Zoe>
<SD_Purchase_Window_End_Zoe>2013-04-01</SD_Purchase_Window_End_Zoe>
<SD_Licensing_Window_start_Zoe>2012-04-01</SD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_start_Zoe></HD_Licensing_Window_start_Zoe>
<HD_Licensing_Window_end_Zoe></HD_Licensing_Window_end_Zoe>
<HD_Purchase_Window_Start_Zoe></HD_Purchase_Window_Start_Zoe>
</xml>
XML;

$oXML1 = new SimpleXMLElement($x1);
$oXML2 = new SimpleXMLElement($x2);

$oOutput = new SimpleXMLElement('<xml></xml>');

foreach ( $oXML1 as $key => $value )
{
    if ( empty($value[0]) )
        $oOutput->addChild($key, $oXML2->{$key}[0]);
    else
        $oOutput->addChild($key, $value[0]);
}

print_r($oOutput->asXML());