如何在php下拉列表中获得所有值

我有一个下拉列表，用户选择一些值，并移动到其他下拉列表通过javascript排序的顺序。我如何在第二个下拉列表中选择值在下一页的PHP变量?

<form name="Example" action="next.php" method="post">
<table border="0" cellpadding="3" cellspacing="0">
    <tr>
        <td>
            <select name="Features" size="9" MULTIPLE>
                <option value="2">Row 2</option>
                <option value="4">Row 4</option>
                <option value="5">Row 5</option>
                <option value="6">Row 6</option>
                <option value="7">Row 7</option>
                <option value="8">Row 8</option>
                <option value="9">Row 9</option>
            </select>
        </td>
        <td align="center" valign="middle">
            <input type="Button" value=">>" style="width:100px" onClick="SelectMoveRows(document.Example.Features,document.Example.FeatureCodes)">
            <br>
            <input type="Button" value="<<" style="width:100px" onClick="SelectMoveRows(document.Example.FeatureCodes,document.Example.Features)"><br>
            <input type="Button" value=">>>>" style="width:100px" onClick="selectAll(document.Example.Features);SelectMoveRows(document.Example.Features,document.Example.FeatureCodes)"><br>
            <input type="Button" value="<<<<" style="width:100px" onClick="selectAll(document.Example.FeatureCodes);SelectMoveRows(document.Example.FeatureCodes,document.Example.Features)">
        </td>
        <td>
            <select name="FeatureCodes[]" id="FeatureCodes" size="9" MULTIPLE>
                <option value="1">Row 1</option>
                <option value="3">Row 3</option>
            </select>
        </td>
    </tr>
    <tr>
    <td><input type="submit" value="submit" id="submit" name="submit"></td>
    </tr>
</table>

提前感谢!!