Php 验证值不能小于0

我在Yii2上有这张表格

Employee Name   : N1
Apply Date      : 2016-08-26
Start Date      : 2016-08-29
Days Leave      : 4 Days
Days Leave Left : 8
Status          : Pending

我期望的结果是，当我输入9天休假时，表单将被验证

"Maximum Quota is Exceeded,Cannot Input"

这是我的模特儿，可以放几天假

  public function daysleaveleft($id,$year) {
        $models = Leave::find()->select(['daysleave'=>'sum(daysleave)'])->where(['EmpId' => $id,'year(startdate)'=>$year])->One();

        $setting = Setting::find()->where(['Var'=>'MaxLeave'])->One();
        return $Setting->Val - $models['daysleave'];            
    }

已编辑

Days Leave | Days Leave Left
    0      |       12
    4      |       8
    3      |       5
    6      |      -1

我希望结果是这样的，当用户输入6时，当他还有5个配额时，表单将被验证。

您可以使用

在规则中添加：

['field_name', 'integer', 'min' => 1],
['field_name', 'validateLeaveDays', 'when' => $this->startdate && $this->EmpId]

并在您的

离开
车型中添加：

public function validateLeaveDaysLeft($attribute) {
    $year = date('Y', strtotime($this->startdate));
    $maxLeaveDays = $this->daysleaveleft($this->EmpId, $year);
    if ($this->$attribute < $maxLeaveDays) {
        $this->addError($attribute, 'Maximum Quota is Exceeded,Cannot Input');
    }
}

daysleaveleft
函数是否在员工模型中？不，它在休假模型中。上面的表单代表哪种模型？它也是休假模型，您如何调用此
daysleaveleft
方法？
public function validateLeaveDaysLeft($attribute) {
    $year = date('Y', strtotime($this->startdate));
    $maxLeaveDays = $this->employee->getLeaveDaysLeft($year);
    if ($this->$attribute < $maxLeaveDays) {
        $this->addError($attribute, 'Maximum Quota is Exceeded,Cannot Input');
    }
}