数组->Json

if(!$this->validate()) return false;
$price_detail_1 = [];
$price_detail = [];
$price_detail_1[]['detail_name'] = $this->attributes['detail_name'];
$price_detail_1[]['detail_price'] = $this->attributes['detail_price'];
$price_detail_1[]['detail_unit'] = $this->attributes['detail_unit'];
foreach ($price_detail_1 as $key => $value) {
    $price_detail['海淀区'][] = $value;
}
$price_detail = json_encode($price_detail);
var_dump($price_detail);die;
$product->load($this->attributes, '');
return $product->update(false);

/media/sf_WWW/juejinqifu/backend/models/PriceForm.php:77:string '{"\u6d77\u6dc0\u533a":[{"detail_name":"we "},{"detail_price":"22"},{"detail_unit":"ewe"}]}' (length=90)

if(!$this->validate()) return false;
$price_detail_1 = [];
$price_detail = [];
$price_detail_1[] = $this->attributes['detail_name'];
$price_detail_1[] = $this->attributes['detail_price'];
$price_detail_1[] = $this->attributes['detail_unit'];
foreach ($price_detail_1 as $key => $value) {
    $price_detail[] = $value;
}
$price_detail = json_encode($price_detail);
var_dump($price_detail);die;
$product->load($this->attributes, '');
return $product->update(false);

/media/sf_WWW/juejinqifu/backend/models/PriceForm.php:77:string '["we ","22","ewe"]' (length=18)