读取xml文和数组转化为xml文件

示例的xml文件代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<req:KnownTrackingRequest xmlns:req="http://www.dhl.com"
                          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                          xsi:schemaLocation="http://www.dhl.com
                  TrackingRequestKnown.xsd">
    <Request>
        <ServiceHeader>
            <MessageTime>2002-06-25T11:28:56-08:00</MessageTime>
            <MessageReference>1234567890123456789012345678</MessageReference>
            <SiteID>TestSiteID</SiteID>
            <Password>testPwd</Password>
        </ServiceHeader>
    </Request>
    <LanguageCode>en</LanguageCode>
    <AWBNumber>8833321221</AWBNumber>
    <AWBNumber>7378615484</AWBNumber>
    <AWBNumber>8882774666</AWBNumber>
    <LevelOfDetails>ALL_CHECK_POINTS</LevelOfDetails>

</req:KnownTrackingRequest>
相应的php代码;
$xml=file_get_contents("test.xml");//读取文件

$data = json_decode(json_encode(simplexml_load_string($xml)),1);//将文件转化为数组

//修改对应的文件参数
$data['AWBNumber']=array("23432524","432432432");
$data['Request']['ServiceHeader']['SiteID']='123';
$data['Request']['ServiceHeader']['Password']='123';

/**
 * 转化函数
 * @param $arr 传入数组
 * @param bool|false $xml
 * @param string $key1
 * @top string 头部
 * @return mixed 返回字符串
 *
 */

function array2xml($arr,$xml=false,$key1="",$top='<root />'){

    if($xml===false){
        $xml=new SimpleXMLElement('<?xml version="1.0" encoding="utf-8"?>'.$top);
    }

    if($arr==array_values($arr)){
        foreach ($arr as $key=>$value) {
            if(is_numeric($key)){
                if(is_array($value)){
                    self::array2xml($value,$xml->addChild($key1),"",$top);
                }else{
                    $xml->addChild($key1,$value);
                }
            }else{
                if(is_array($value)){
                    self::array2xml($value,$xml->addChild($key1),$key,$top);
                }else{
                    $xml->addChild($key1,$value);
                }
            }
        }
    }else{
        if($key1){
            $child=$xml->addChild($key1);
        }else{
            $child=$xml;
        }
        foreach ($arr as $key=>$value) {
            if(is_array($value)){
                self::array2xml($value,$child,$key,$top);
            }else{
                $child->addChild($key,$value);
            }
        }
    }
    return $xml->asXml();
}

//返回新的xml字符串

$newxml=array2xml($data,false,"",'<KnownTrackingRequest xmlns:req="http://www.dhl.com"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                    xsi:schemaLocation="http://www.dhl.com
TrackingRequestKnown.xsd" />')

//由于头部为req：KnownTrackingRequest 时会为所有的元素加上req：，单独提取出来替换，得到相同的xml字符串

$newxml=str_replace("KnownTrackingRequest","req:KnownTrackingRequest",$newxml);

print_r($newxml);