php拼接数组

$aLines = Array ( 
    [0] => Array ( 
        [0] => 8 
        [1] => 30208201 
        [2] => 3 
    ) 
    [1] => Array ( 
        [0] => 1 
        [1] => 2 
        [2] => 1 
    ) 
    [2] => Array ( 
        [0] => 8 
        [1] => 30208204 
        [2] => 1 
    ) 
    [3] => Array ( 
        [0] => 8 
        [1] => 30208205 
        [2] => 1 
    ) 
) 

$count = count($aLines);//统计多少个数组

     if($count != 1){

        $array=array();
        $k = 0;
        $setsql = ' , had_attachment = 1 ';//测试

        foreach($aLines as $arr){

            if($arr[1] == 2){

                $setsql .= " , attachment_gold = ".$arr[1]." ";

            }else{

                if (!array_key_exists($arr[1],$array)){
                    //检查键名是否存在于数组中,没有就存进去。
                    $array[$k]=array($arr[1]);
                }


                $tab[$k][0]=$arr[0];
                $tab[$k][1]=$arr[1];
                $tab[$k][2]=$arr[2];

            }

            $k++;
        }


        $w = json_encode(array_values($array));


        $setsql .= " , attachment_items = '".$w."' ";


     }



    echo $setsql;