我有一個(gè)名為“apps.xml”的 XML 文件，其結(jié)構(gòu)如下：<?xml version="1.0" encoding="utf-8"?><applications>    <app id="b461ae4a" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" />    <app id="1c94395b" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" /></applications>我希望能夠使用在我的網(wǎng)站上運(yùn)行的 PHP 腳本 ($_GET)、DOM 和 Xpath 添加、修改和更新（保存對(duì)文件的更改）上述 XML 文件。添加新的 XML 條目（最后一行）后，文件輸出將如下所示：<?xml version="1.0" encoding="utf-8"?><applications>    <app id="b461ae4a" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" />    <app id="1c94395b" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" />    <app id="d65k274p" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" /></applications>修改/更新后（第一個(gè)條目修改/更新）將如下所示：<?xml version="1.0" encoding="utf-8"?><applications>    <app id="b461ae4a" valid="1" company="Orange Inc." appname="None" user="tommy" description="Test" note="None" />    <app id="1c94395b" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" />    <app id="d65k274p" valid="0" company="Lemon Inc." appname="None" user="admin" description="Test" note="None" /></applications>并添加更多示例我正在努力實(shí)現(xiàn)的目標(biāo)：http://www.myadress.com/apps.php?append=1&id=d65k274p&valid=1&company=Orange%20Inc&appname=None&user=admin&description=Test&note=None// Append argument would decide to add a whole new entry set to 1 or if it is on 0 then to be modified the whole entry by given "id".$xappend = $_GET["append"];$xid = $_GET["id"];$xvalid = $_GET["valid"];$xcompany = $_GET["company"];$xappname = $_GET["appname"];$xuser = $_GET["user"];$xdescription = $_GET["description"];$xnote = $_GET["note"];if (file_exists('apps.xml')) {    $xorig = simplexml_load_file('apps.xml');} else {    exit('Failed to open apps.xml !');}任何幫助將不勝感激！