Question

我有：

Dim i as Integer
Dim s as String

i = 2
s = "test" & i

所以：

GridView

问题是此代码接受负数，如-70，-20，-30！为什么呢？

Answer 1

整数可以是负数。如果要限制值可以具有的范围，可以向验证过滤器添加选项：

$options = [
    'options' => [
        'min_range' => 0,
        'max_range' => 1000    // or for example PHP_INT_MAX
    ]
];

if (!filter_var($user_number, FILTER_VALIDATE_INT, $options))
{
    ...
}

Answer 2

我检查了一个单独的条件来检查负值，请查看我的代码：

$user_number = trim(preg_replace( "/\s+/", " ", $_POST['number']));

if($user_number < 0 || !filter_var($user_number, FILTER_VALIDATE_INT))
{
    echo "<script>alert('Invalid number inserted.');</script>";
}

Answer 3

以下解决方案可能会对您有所帮助。添加一个附加条件

$user_number = trim(preg_replace( "/\s+/", " ", $_POST['number']));

if(!filter_var($user_number, FILTER_VALIDATE_INT) || (!ereg('^[0-9]+$', $user_number)))
{
    echo "<script>alert('Invalid number inserted.');</script>";
}

PHP filter_var问题

3 个答案: