PHP：分享二维数组转成一维数组的两种方法

在PHP项目开发中数组是经常操作的数据类型，不过没想到的是今天居然在二维数组转一维数组的操作中翻了船。好在仔细检查之后都解决了。下面就将二维数组转一维数组的两种方法分享一下，以及避免再次入坑。

一、需求：

转换前的二维数组格式。

array(2) { [0]=> array(7) { ["id"]=> string(2) "46" ["goods_id"]=> string(5) "77433" ["model_name"]=> string(6) "颜色" ["model_sub_name"]=> array(4) { [0]=> string(6) "黑色" [1]=> string(6) "肤色" [2]=> string(6) "粉色" [3]=> string(9) "浅蓝色" } ["goods_stock"]=> array(1) { [0]=> string(3) "254" } ["curr_price"]=> array(1) { [0]=> string(4) "31.5" } ["goods_weight"]=> array(1) { [0]=> string(3) "280" } } [1]=> array(7) { ["id"]=> string(2) "47" ["goods_id"]=> string(5) "77433" ["model_name"]=> string(6) "尺码" ["model_sub_name"]=> array(4) { [0]=> string(1) "S" [1]=> string(1) "M" [2]=> string(1) "L" [3]=> string(2) "XL" } ["goods_stock"]=> array(1) { [0]=> string(3) "254" } ["curr_price"]=> array(1) { [0]=> string(4) "31.5" } ["goods_weight"]=> array(1) { [0]=> string(3) "280" } } }

转换后的数组格式：

array(8) { [0]=> array(5) { ["model_name"]=> string(6) "颜色" ["model_sub_name"]=> string(6) "黑色" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [1]=> array(5) { ["model_name"]=> string(6) "颜色" ["model_sub_name"]=> string(6) "肤色" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [2]=> array(5) { ["model_name"]=> string(6) "颜色" ["model_sub_name"]=> string(6) "粉色" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [3]=> array(5) { ["model_name"]=> string(6) "颜色" ["model_sub_name"]=> string(9) "浅蓝色" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [4]=> array(5) { ["model_name"]=> string(6) "尺码" ["model_sub_name"]=> string(1) "S" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [5]=> array(5) { ["model_name"]=> string(6) "尺码" ["model_sub_name"]=> string(1) "M" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [6]=> array(5) { ["model_name"]=> string(6) "尺码" ["model_sub_name"]=> string(1) "L" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } [7]=> array(5) { ["model_name"]=> string(6) "尺码" ["model_sub_name"]=> string(2) "XL" ["goods_stock"]=> string(3) "254" ["curr_price"]=> string(4) "31.5" ["goods_weight"]=> string(3) "280" } }

这种格式看起来可能比较乱，但是适合复制测试。其中model_sub_name、goods_stock、curr_price、goods_weight都是数组格式，如果goods_stock、curr_price、goods_weight数组只有一个元素的时候，不同的model_sub_name对应的都是这一个元素，如果元素大于1，那么就需要model_sub_name下标所对应的goods_stock、curr_price、goods_weight值作为新数组的相关键值。

解决方法：

方法一、foreach循环,或for循环都行。就贴一个foreach吧。

$model = array();
foreach($guige as $key=>$value){
foreach($value['model_sub_name'] as $k=>$v){
$model[$t]['model_name'] = $value['model_name'];
$model[$t]['model_sub_name'] = $v;
$model[$t]['goods_stock'] = sizeof($value['goods_stock'])>1?$value['goods_stock'][$k]:$value['goods_stock'][0];
$model[$t]['curr_price'] = sizeof($value['curr_price'])>1?$value['curr_price'][$k]:$value['curr_price'][0];
$model[$t]['goods_weight'] = sizeof($value['goods_weight'])>1?$value['goods_weight'][$k]:$value['goods_weight'][0];
$t +=1 ;
}
}