php 将二维数组批量插入到数据库中

$arr = array(
   array('id'=>,'name'=>'ceshi4'),
   array('id'=>,'name'=>'ceshi5'),
   array('id'=>,'name'=>'ceshi6'),
);
foreach($arr as $v){
    $valueStr .= "(".$v['id'].",'".$v['name']."'),";
} 

$valueStr = rtrim($valueStr,',');
$sql = "INSERT into `td_list`(id,name) values $valueStr";