yii 2日期选择器仅在今天之前允许

echo $form->field($model, 'dob')->widget(DatePicker::classname(), [
  'options' => [
    'placeholder' => Yii::t('app', 'Please pick your birth-date'), 
  ],
  'type' => DatePicker::TYPE_INPUT,
  'pluginOptions' => [
    'autoclose'=>true,
    'format' => 'dd/mm/yyyy',
    'startView' => 1,
  ],
])->label(Yii::t('app', 'Date of Birth'));

The code above is used to create a DatePicker in yii 2. Is it possible for me to only allow users to select date before today?

Yes, you can the future dates disable by endDate property of pluginOptions.

echo $form->field($model, 'dob')->widget(DatePicker::classname(), [
  'options' => [
    'placeholder' => Yii::t('app', 'Please pick your birth-date'), 
  ],
  'type' => DatePicker::TYPE_INPUT,
  'pluginOptions' => [
    'autoclose'=>true,
    'format' => 'dd/mm/yyyy',
    'startView' => 1,
    'endDate'=>date('d/m/Y')
  ],
])->label(Yii::t('app', 'Date of Birth'));