PHP：为什么我的函数 validate_ip() 未定义？

Question

我收到错误 "PHP Fatal error: Uncaught Error: Call to undefined function validate_ip()" 并想了解原因。

函数get_ip_address()调用函数validate_ip()时出现错误。这两个函数都在同一个文件中，并且将包含在 require_once 中。那么为什么函数"undefined"?

或者错误可能有其他原因？

提前谢谢你，马蒂亚斯

/**
 * Get Ip Adddress
 * @return [varchar] [IP Address]
 */
protected function get_ip_address() 
{

    if (!empty($_SERVER['HTTP_CLIENT_IP']) && validate_ip($_SERVER['HTTP_CLIENT_IP'])) {
        return $_SERVER['HTTP_CLIENT_IP'];
    }

    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',') !== false) {
            $iplist = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            foreach ($iplist as $ip) {
                if (validate_ip($ip))
                    return $ip;
            }
        } else {
            if (validate_ip($_SERVER['HTTP_X_FORWARDED_FOR']))
                return $_SERVER['HTTP_X_FORWARDED_FOR'];
        }
    }
    if (!empty($_SERVER['HTTP_X_FORWARDED']) && validate_ip($_SERVER['HTTP_X_FORWARDED']))
        return $_SERVER['HTTP_X_FORWARDED'];
    if (!empty($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']) && validate_ip($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']))
        return $_SERVER['HTTP_X_CLUSTER_CLIENT_IP'];
    if (!empty($_SERVER['HTTP_FORWARDED_FOR']) && validate_ip($_SERVER['HTTP_FORWARDED_FOR']))
        return $_SERVER['HTTP_FORWARDED_FOR'];
    if (!empty($_SERVER['HTTP_FORWARDED']) && validate_ip($_SERVER['HTTP_FORWARDED']))
        return $_SERVER['HTTP_FORWARDED'];

    return $_SERVER['REMOTE_ADDR'];
}


 /**
 * Ensures an ip address is both a valid IP and does not fall within
 * a private network range.
 */
protected function validate_ip($ip)
{
    if (strtolower($ip) === 'unknown')
        return false;

    $ip = ip2long($ip);

    // if the ip is set and not equivalent to 255.255.255.255
    if ($ip !== false && $ip !== -1) {
        /** make sure to get unsigned long representation of ip
        * due to discrepancies between 32 and 64 bit OSes and
        * signed numbers (ints default to signed in PHP) 
        */
        $ip = sprintf('%u', $ip);
        // do private network range checking
        if ($ip >= 0 && $ip <= 50331647) return false;
        if ($ip >= 167772160 && $ip <= 184549375) return false;
        if ($ip >= 2130706432 && $ip <= 2147483647) return false;
        if ($ip >= 2851995648 && $ip <= 2852061183) return false;
        if ($ip >= 2886729728 && $ip <= 2887778303) return false;
        if ($ip >= 3221225984 && $ip <= 3221226239) return false;
        if ($ip >= 3232235520 && $ip <= 3232301055) return false;
        if ($ip >= 4294967040) return false;
    }
    return true;
}

这是完整的错误日志：

[05-Dec-2018 21:37:07 Europe/Berlin] PHP Fatal error: Uncaught Error: Call to undefined function validate_ip() in /home/www/crm3/clients/app/http/controllers/ProfileController.php:258 Stack trace:
0 /home/www/crm3/clients/app/http/controllers/ProfileController.php(135): ProfileController->get_ip_address()
1 /home/www/crm3/clients/app/http/controllers/ProfileController.php(72): ProfileController->update(Array)
2 /home/www/crm3/clients/builder/engine/Router.php(53): ProfileController->profileAction()
3 /home/www/crm3/clients/builder/engine/Router.php(42): Router->dispatch(Array)
4 /home/www/crm3/clients/builder/bootstrap.php(77): Router->route('profile', 'POST')
5 /home/www/crm3/clients/index.php(36): require_once('/home/www/crm3...')
6 {main}
thrown in /home/www/crm3/clients/app/http/controllers/ProfileController.php on line 258

编辑：添加了错误日志

Answer 1

问题出在函数定义本身。您将函数定义为 "protected function".

A "protected" 函数是 classes 中使用的可见性关键字，用于定义无法从 class 本身外部访问的函数。在 class.

之外使用是没有意义的

如果您从定义中删除 "protected" 关键字，您可以毫无问题地调用您的函数。

Answer 2

如果这些是同一个 class 中的方法，那么您需要调用 $this->validate_ip($ip).

如果这些只是文件中的函数，那么您需要从函数声明中删除 protected。

PHP：为什么我的函数 validate_ip() 未定义？

PHP: Why is my function validate_ip() undefined?

php

undefined