如何使用PHP将同名的多个节点写入XML文件？

Question

I'm trying to use my PHP to take input from a form and write it to an XML file. It works fine for the unique fields, but there's one field that can be inputted 4 times.

When more than one is entered, only the last one is written to the XML file.

My PHP:

<?php
        if(isset($_REQUEST['ok'])){
            $xml = new DOMDocument("1.0","UTF-8");
            $xml->load("../Players.xml");

            $rootTag = $xml->getElementsByTagName("site")->item(0);

            $entryTag = $xml->createElement("entry");

            $nameTag = $xml->createElement("name",$_REQUEST['name']);
            $countryTag = $xml->createElement("country",$_REQUEST['country']);
            $memTag = $xml->createElement("mem",$_REQUEST['mem']);

            $entryTag->appendChild($nameTag);
            $entryTag->appendChild($countryTag);
            $entryTag->appendChild($memTag);

            $rootTag->appendChild($entryTag);
            $xml->save("../Players.xml");

       }
?>

Form:

        <form action="index.php" method="post">
            <input type="text" name="name"/>
            <input type="text" name="country"/>
            <input type="text" name="mem"/>
            <input type="text" name="mem"/>
            <input type="text" name="mem"/>
            <input type="text" name="mem"/>
            <input type="submit" name="ok"/>
        </form>

Answer 1

Technically, just by several pairs of instrucntions similar to

$memTag = $xml->createElement("mem",$_REQUEST['mem']);
$entryTag->appendChild($memTag);

The result is supposed to be as several appended nodes, like:

<entry>
    <mem>bla-bla</mem>
    <mem>bla123</mem>
</entry>

But... How come the parameters are directly in $_REQUEST ? And did you check how many parameters with name 'mem' are sent from the browser?