带有表单的文件(file1.PHP)：

<script type="text/javascript">
    function selectAll() 
    { 
        selectBox = document.getElementById("someId");
 
        for (var i = 0; i < selectBox.options.length; i++) 
        { 
             selectBox.options[i].selected = true; 
        } 
    }
</script>
 
<form method="post" action="file2.PHP">
    <select id="someId" name="selectName[]" multiple>
        <option value="123.123.123.123">123.123.123.123</option>
        <option value="234.234.234.234">234.234.234.234</option>
    </select>
    <input type="submit" name="submit" value=Submit onclick="selectAll();">
</form>

接收POST的文件(file2.PHP)：

<?PHP
    foreach ($_POST['selectName'] as $item)
    {
    print "$item<br/>";
    }
?>