擷取商品的笛卡爾積

public function getSpecInput($goods_id, $spec_arr)

    {

        // <input name="item[2_4_7][price]" value="100" /><input name="item[2_4_7][name]" value="藍色_S_長袖" />        

        // $goods_id = 18;

        // $spec_arr = array(         

        //     20 => array('7','8','9'),

        //     10=>array('1','2'),

        //     1 => array('3','4'),

        // );          

        // 排序

        foreach ($spec_arr as $k => $v)

        {

            $spec_arr_sort[$k] = count($v);

        }

        asort($spec_arr_sort);        

        foreach ($spec_arr_sort as $key =>$val)

        {

            $spec_arr2[$key] = $spec_arr[$key];

        }

        $clo_name = array_keys($spec_arr2);      

        $spec_arr2 = $this->combineDika($spec_arr2,3); //  擷取 規格的 笛卡爾積                         

        $spec = $this->asArray(DB::table('spec')->select(['id','spec_name'])->get()); // 規格表id,name

        $spec = $this->array_change($spec);

        $specItem = $this->asArray(DB::table('spec_item')->select(['id','spec_id','item'])->get());//規格項id,item,spec_id

        $specItem = $this->array_change($specItem);

        $keySpecGoodsPrice = $this->asArray(DB::table('products')->select(['product_sn','price','sku','key_name','key','member_price'])->where('goods_id',$goods_id)->get());//規格項           

        $str = "<table class='table table-bordered' id='spec_input_tab'>";

        $str .="<tr>";      

       // 顯示第一行的資料

       foreach ($clo_name as $k => $v)

       {

           $str .=" <td><b>{$spec[$v]['spec_name']}</b></td>";

       }    

        $str .="<td><b>價格</b></td>

                <td><b>會員價格</b></td>

                <td><b>團購價格</b></td>

                <td><b>庫存</b></td>

             </tr>";

       // 顯示第二行開始

       foreach ($spec_arr2 as $k => $v)

       {

            $str .="<tr>";

            $item_key_name = array();

            foreach($v as $k2 => $v2)

            {

                $str .="<td>{$specItem[$v2]['item']}</td>";

                $item_key_name[$v2] = $spec[$specItem[$v2]['spec_id']]['spec_name'].':'.$specItem[$v2]['item'];

            }  

            ksort($item_key_name);            

            $item_key = implode('_', array_keys($item_key_name));

            $item_name = implode(' ', $item_key_name);

            $product_sn = 'no_'.time().rand(11111,99999);

            $str .="<input type='hidden' name='item[$item_key][product_sn]' value='$product_sn'>";

            $str .="<td><input name='item[$item_key][price]' οnkeyup='this.value=this.value.replace(/[^\d.]/g,\"\")' οnpaste='this.value=this.value.replace(/[^\d.]/g,\"\")' /></td>";

            $str .="<td><input name='item[$item_key][member_price]' οnkeyup='this.value=this.value.replace(/[^\d.]/g,\"\")' οnpaste='this.value=this.value.replace(/[^\d.]/g,\"\")'/></td>";            

            $str .="<td><input name='item[$item_key][group_price]' οnkeyup='this.value=this.value.replace(/[^\d.]/g,\"\")' οnpaste='this.value=this.value.replace(/[^\d.]/g,\"\")'/></td>";

            $str .="<td><input name='item[$item_key][sku]'  />

                <input type='hidden' name='item[$item_key][key_name]' value='$item_name' /></td>";

            $str .="</tr>";           

       }

       $str .= "</table>";

       return $str;   

    }

    public function array_change($arr,$id = 'id')

    {

        $newArr = [];

        foreach($arr as $k => $v){

            $newArr[$v[$id]] = $v;

        }

        return $newArr;

    }

    function combineDika() {

        $data = func_get_args();

        $data = current($data);

        $cnt = count($data);

        $result = array();

        $arr1 = array_shift($data);

        foreach($arr1 as $key=>$item)

        {

            $result[] = array($item);

        }       

        foreach($data as $key=>$item)

        {                                

            $result = $this->combineArray($result,$item);

        }

        return $result;

    }

    function combineArray($arr1,$arr2) {         

        $result = array();

        foreach ($arr1 as $item1)

        {

            foreach ($arr2 as $item2)

            {

                $temp = $item1;

                $temp[] = $item2;

                $result[] = $temp;

            }

        }

        return $result;

    }

最終的效果圖如下：