在codeigniter中验证max_length,min_length

Question

我在尝试CodeIgniter为min_length和max_length验证约束设置自定义验证消息时收到错误.

这些是我的验证规则:

$this->form_validation->set_rules('username', 'Username', 'required|xss_clean|min_length[6]|max_length[10]');
$this->form_validation->set_rules('password', 'Password', 'required|min_length[8]|max_length[20]';

这些是我的自定义验证消息:

$this->form_validation->set_message('min_length[3]', '%s: the minimum of characters is three');
$this->form_validation->set_message('max_length[20]', '%s:the maximum of characters is 20');

在我的例子中,我们有两个字段,但我有许多字段具有不同的最小和最大长度值.它们都有特定的约束验证.此消息不起作用.默认情况下会显示该消息.谢谢你的帮助.

Answer 1

只需添加另一个%s即可获得长度值..

$this->form_validation->set_message('min_length', '%s: the minimum of characters is %s');

只有在%s 第二次使用时才会给出尺寸.第一次它会给你指定的字段名称..

Answer 2

$this->form_validation->set_rules('password', 'Password', 'required|min_length[8]|max_length[20]';

缺少一个结束括号 - ):

$this->form_validation->set_rules('password', 'Password', 'required|min_length[8]|max_length[20]');

更新
也许使用回调函数会更好吗？例如:

$this->form_validation->set_rules('username', 'Username', 'required|xss_clean|callback__check_length[6,10]');


/**
 * Callback function. Checks if the length of the user's input
 * conforms to minimum and maximum character length requirements
 *
 * @param  string
 * @param  int
 * @param  int
 * @return bool
 */
function _check_length($input, $min, $max)
{
    $length = strlen($input);

    if ($length <= $max && $length >= $min)
    {
        return TRUE;
    }
    elseif ($length < $min)
    {
        $this->form_validation->set_message('_check_length', 'Minimum number of characters is ' . $min);
        return FALSE;        
    }
    elseif ($length > $max)
    {
        $this->form_validation->set_message('_check_length', 'Maximum number of characters is ' . $max);
        return FALSE;        
    }
}