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>