分享简单代码实现wordpress用户注册IP地址限制

function validate_reg_ip() {
	global $err_msg; 
	$allow_time = 1; //每个IP允许注册的用户数
	$allowed = true;
	$ips = file_get_contents("ip.php");
	$times = substr_count($ips,getIp());
	if($times >=$allow_time) {
		$allowed = false;
		$err_msg = "该IP注册用户超过上限，无法继续注册！";
	}
	$ips = '';
	return $allowed;
}
add_filter('validate_username', 'validate_reg_ip', 10, 1);
function ip_restrict_errors($errors) {
	global $err_msg;
	if ( isset( $errors->errors['invalid_username'] ) )
	$errors->errors['invalid_username'][0] = __( $err_msg, ' ' );
	return $errors;
}
add_filter('registration_errors', 'ip_restrict_errors');
function update_reg_ip(){
file_put_contents("ip.txt",getIp()."\r\n",FILE_APPEND);
}
add_action('user_register','update_reg_ip');
function getIp(){
	if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
	$ip = getenv("HTTP_CLIENT_IP");
	else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
	$ip = getenv("HTTP_X_FORWARDED_FOR");
	else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
	$ip = getenv("REMOTE_ADDR");
	else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
	$ip = $_SERVER['REMOTE_ADDR'];
	else
	$ip = "unknown";
	return $ip;
}