phalcon: 过滤（Phalcon\Filter（））

过滤，就是清除不需要的数据，留下想要的数据。

其调用方法如下，一：

$filter = new \Phalcon\Filter();
$filter->sanitize("some(one)@exa\mple.com", "email");

得到的结果是："someone@example.com"

　　

另外一种方法是：

直接通过getPost/get获取

//gby(one)ftk\wf@qq.com
$email = $this->request->getPost("email", "email");
echo $email;
//gbyoneftkwf@qq.com
//$this->request->getPost("参数名", "email(需要验证的规则)");

　　

自定义过滤器：

案一：
class IPv4Filter
{

    public function filter($value)
    {
        return filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
    }

}

$filter = new \Phalcon\Filter();

//Using an object
$filter->add('ipv4', new IPv4Filter());

//Sanitize with the "ipv4" filter
$filteredIp = $filter->sanitize("127.0.0.1", "ipv4");

案二：
$filter = new \Phalcon\Filter();

//Using an anonymous function
$filter->add('md5', function($value) {
    return preg_replace('/[^0-9a-f]/', '', $value);
});

//Sanitize with the "md5" filter
$filtered = $filter->sanitize($possibleMd5, "md5");

　　

内置过滤器类型（Types of Built-in Filters）

The following are the built-in filters provided by this component:

Name	Description
string	Strip tags
email	Remove all characters except letters, digits and !#$%&*+-/=?^_`{|}~@.[].
int	Remove all characters except digits, plus and minus sign.
float	Remove all characters except digits, dot, plus and minus sign.
alphanum	Remove all characters except [a-zA-Z0-9]
striptags	Applies the strip_tags function
trim	Applies the trim function
lower	Applies the strtolower function
upper	Applies the strtoupper function