You are here
解决Laravel表单提交默认将空值转为null 有大用
在Laravel中，使用$request->inptu('field')，获取参数值为空的时候，输出的值为null
1
2
3
4
5
6name: peak
province: 北京市
city: 崇文区
mobile: 18000000000
address: 你猜猜看
zip:
获取 zip 的值
1
2$zip = $request->input('zip', '');
dd($zip);
发现 zip 并没有输出 ''，而是输出 null
原来，在 Illuminate/Foundation/Http 组件中有定义这个中间件
vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
namespace Illuminate\Foundation\Http\Middleware;
class ConvertEmptyStringsToNull extends TransformsRequest
{
/**
* Transform the given value.
*
* @param string $key
* @param mixed $value
* @return mixed
*/
protected function transform($key, $value)
{
return is_string($value) && $value === '' ? null : $value;
}
}
解决方法：
在 app/Http/Kernel.php 中注释掉 \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class 即可
1
2
3
4
5
6
7protected $middleware = [
\App\Http\Middleware\TrustProxies::class,
\App\Http\Middleware\CheckForMaintenanceMode::class,
\Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
\App\Http\Middleware\TrimStrings::class,
//\Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
];