Laravel 验证器`required` 也因空字符串而失败
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Laravel validator `required` fails for empty string also
提问by shahalpk
I'm trying laravel requiredvalidator in my code, unfortunately it fails for even empty string. I do not want it fail for empty string.
我正在required我的代码中尝试 laravel验证器，不幸的是它甚至对空字符串也失败了。我不希望它因空字符串而失败。
$validator = \Validator::make(array("name"=>""), array("name"=>"required"));
if ($validator->fails()){
var_dump($validator->messages());
} else {
die("no errors :)");
}
It gives me the following output
它给了我以下输出
object(Illuminate\Support\MessageBag)[602]
protected 'messages' =>
array (size=1)
'name' =>
array (size=1)
0 => string 'The name field is required.' (length=27)
protected 'format' => string ':message' (length=8)
It is supposed to pass, since i'm giving an empty string as the namefield.
它应该通过，因为我给出了一个空字符串作为name字段。
The above behavior happens in OSX environment (PHP Version 5.5.18), but it works fine in linux environment (PHP Version 5.5.9-1ubuntu4.5).
上述行为发生在 OSX 环境（PHP 版本 5.5.18）中，但在 linux 环境（PHP 版本 5.5.9-1ubuntu4.5）中运行良好。
回答by lukasgeiter
The requiredrule actually returns false if you pass an empty string.
required如果您传递一个空字符串，该规则实际上会返回 false。
If we look at the code (Illuminate\Validation\Validator)
如果我们看代码 ( Illuminate\Validation\Validator)
protected function validateRequired($attribute, $value)
{
if (is_null($value))
{
return false;
}
elseif (is_string($value) && trim($value) === '')
{
return false;
}
// [...]
return true;
}
I think your only option here is to write your own validation rulethat checks if the value is not null:
我认为您在这里唯一的选择是编写自己的验证规则来检查值是否为空：
Validator::extendImplicit('attribute_exists', function($attribute, $value, $parameters){
return ! is_null($value);
});
(The extendImplicitis needed because with extendcustom rules will only run when the value is not an empty string)
（这extendImplicit是必需的，因为extend自定义规则只会在值不是空字符串时运行）
And then use it like this:
然后像这样使用它：
\Validator::make(array("name"=>""), array("name"=>"attribute_exists"));
回答by Igor Panchenko
I use this:
我用这个：
'my_field' => 'present'
回答by iosifv
In Laravel 5.6 you can use just this:
在 Laravel 5.6 中你可以只使用这个：
public function rules()
{
return [
'my_field' => 'required|string|nullable'
];
}
Might work on older versions as well, I only tried on 5.6
可能也适用于旧版本，我只试过 5.6
回答by The EasyLearn Academy
i have developed my own way to process optional input. i use associative array for validation.
我开发了自己的方式来处理可选输入。我使用关联数组进行验证。
$rules = array('sltcategoryid' => 'required',
'txttitle' => 'required|min:10|max:255',
'txtdetail' => 'required|min:10|max:255',
'rdocontenttype' => 'required',
'rdoislive' => 'required');
if($request->rdocontenttype=="1" || $request->rdocontenttype=="2" && trim($request->txtcontent)=="")
$rules["txtcontent"]="required|min:10|max:2048";
else if ($request->rdocontenttype=="3" && isset($request->fildata)==false)
$rules["fildata"] ="required|mimes:png,jpg,jpeg,pdf,doc,xls,ppt,bmp,zip";
$validator = Validator::make($request->all(),$rules);
if ($validator->fails())
return redirect('content/create')->withErrors($validator)->withInput();
else
return back()->with("message","content processed successfully");
