php 批量添加多行文本框textarea一行一个

$act=!empty($_GET[act]) ? trim($_GET[act]) : ;
switch($act) {
case adda:
$area[a_value] = trim($_POST[a_value]);
$area[a_type]=3;
if(strpos($area[a_value], "\n") === false) {
//echo $area[a_value];
//add($area);
//$DB->insert(bcrh_article_attr,$area);

}
else
{
$areanames = explode("\n", $area[a_value]);
foreach($areanames as $areaname) {
$areaname = trim($areaname);
if(!$areaname) continue;
//echo $areaname.|;
$area[a_value] = $areaname;
//$DB->insert(bcrh_article_attr,$area);


}
}
header("refresh:0;url=gfxrtz.php");//跳转页面，注意路径
exit;

break;
}

<form method="post" action="?act=adda" onsubmit="return Dcheck();" >
<table cellpadding="2" cellspacing="1" class="tb">
<tr>
<td class="tl"><span class="f_hid">*</span> 属性</td>
<td>

<textarea name="a_value" id="a_value" style="width:200px;height:100px;overflow:visible;"></textarea>
允许批量添加，一行一个，点回车换行</td>
</tr>
</table>
<div class="sbt"><input type="submit" name="submit" value="确 定" class="btn"> <input type="reset" name="reset" value="重 置" class="btn"></div>
</form>