php - 检查字符串长度、最大值和最小值

Question

是否有检查字符串是否太长或太短的功能，我通常会在几个地方写这样的东西:

if (strlen($input) < 12)
{
   echo "Input is too short, minimum is 12 characters (20 max).";
}
elseif(strlen($input) > 20)
{
   echo "Input is too long, maximum is 20 characters.";
}

我知道你可以很容易地写一个，但是 PHP 中有内置的吗？

我通常会在验证输入时收集错误，因此将编写上述代码:

$errors = array();

    if (strlen($input) < 12)
    {
       $errors['field_name'] = "Field Name is too short, minimum is 12 characters (20 max).";
    }
    elseif(strlen($input) > 20)
    {
       $errors['field_name'] = "Field Name is too long, maximum is 20 characters.";
    }

如何把它变成一个函数^？

Answer 1

我猜你可以做一个这样的函数:

function validStrLen($str, $min, $max){
    $len = strlen($str);
    if($len < $min){
        return "Field Name is too short, minimum is $min characters ($max max)";
    }
    elseif($len > $max){
        return "Field Name is too long, maximum is $max characters ($min min).";
    }
    return TRUE;
}

然后你可以这样做:

$errors['field_name'] = validStrLen($field, 12, 20);