PHP：验证美国电话号码

我目前正在验证美国电话号码.问题是以下代码始终在有效或无效输入后回显请输入有效的电话号码.我的代码的基本逻辑是我正在检查preg_match以查看是否匹配有效数字. Example

我该如何解决这个问题,还是有更好的方法来验证电话号码？
此外,是否有回音格式如下：[phone]？

PHP：

if (isset($_POST['phone'])) {
    if(preg_match('/^(\({1}\d{3}\){1}|\d{3})(\s|-|.)\d{3}(\s|-|.)\d{4}$/',$phone)) {
        echo ('<div id="phone_input"><span id="resultval">'.$phone.'</span></div>');
    }
    else {
        echo '<div id="phone_input"><span id="resultval">Please enter a valid phone number</span></div>';
    }
}

解决方法:

尝试这个

<?PHP
class Validation {
    public $default_filters = array(

        'phone' => array(
            'regex'=>'/^\(?(\d{3})\)?[-\. ]?(\d{3})[-\. ]?(\d{4})$/',
            'message' => 'is not a valid US phone number format.'
        )
    );
    public $filter_list = array();

    function Validation($filters=false) {
        if(is_array($filters)) {
            $this->filters = $filters;
        } else {
            $this->filters = array();
        }
    }

    function validate($filter,$value) {
        if(in_array($filter,$this->filters)) {
            if(in_array('default_filter',$this->filters[$filter])) {
                $f = $this->default_filters[$this->filters[$filter]['default_filter']];
                if(in_array('message',$this->filters[$filter])) {
                    $f['message'] = $this->filters[$filter]['message'];
                }
            } else {
                $f = $this->filters[$filter];
            }
        } else {
            $f = $this->default_filters[$filter];
        }
        if(!preg_match($f['regex'],$value)) {
            $ret = array();
            $ret[$filter] = $f['message'];
            return $ret;
        }
        return true;
    }
}

//example usage
$validation = new Validation();
echo nl2br(print_r($validation->validate('phone','555-555-1212'),true));
echo nl2br(print_r($validation->validate('phone','(555)-555-1212'),true));
echo nl2br(print_r($validation->validate('phone','555 555 1212'),true));
echo nl2br(print_r($validation->validate('phone','555.555.1212'),true));
echo nl2br(print_r($validation->validate('phone','(555).555.1212'),true));
echo nl2br(print_r($validation->validate('phone','(555)---555.1212'),true));//will not match
?>