在我的登录表单脚本中输入错误的登录凭据时，我无法输出用户IP地址到文本文件。我怎么能解决这个问题呢？ Error at the bottom of the screenshot. GitHub repo link
此外，我认为这两个问题都存在于functions.php。但是，我会把index.php文件编码加入。
的functions.php
function getBrowser()
{
$u_agent = $_SERVER['HTTP_USER_AGENT'];
$ip_add = $_SERVER['HTTP_CLIENT_IP'];
$bname = 'Unknown';
$platform = 'Unknown';
$version= "";
//Fetch platform info
if (preg_match('/macintosh|mac os x/i', $u_agent)) {
$platform = 'mac'; //supports mac
}
elseif (preg_match('/windows|win32/i', $u_agent)) {
$platform = 'windows'; //supports windows
}
// Next get the name of the useragent yes seperately and for good reason
if(preg_match('/MSIE/i',$u_agent) && !preg_match('/Opera/i',$u_agent))
{
$bname = 'Internet Explorer'; //supports IE
$ub = "MSIE";
}
elseif(preg_match('/Firefox/i',$u_agent)) //supports FIREFOX
{
$bname = 'Mozilla Firefox';
$ub = "Firefox";
}
elseif(preg_match('/Chrome/i',$u_agent))
{
$bname = 'Google Chrome'; //supports chrome
$ub = "Chrome";
}
elseif(preg_match('/Safari/i',$u_agent))
{
$bname = 'Apple Safari';
$ub = "Safari"; //supports safari
}
elseif(preg_match('/Microsoft edge/i',$u_agent))
{
$bname = 'Microsoft edge';
$ub = "Edge"; //supports Edge
}
// finally get the correct version number
$known = array('Version', $ub, 'other');
$pattern = '#(?<browser>' . join('|', $known) .
')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';
if (!preg_match_all($pattern, $u_agent, $matches)) {
// we have no matching number just continue
}
// see how many we have
$i = count($matches['browser']);
if ($i != 1) {
//we will have two since we are not using 'other' argument yet
//see if version is before or after the name
if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
$version= $matches['version'][0];
}
else {
$version= $matches['version'][1];
}
}
else {
$version= $matches['version'][0];
}
// check if we have a number
if ($version==null || $version=="") {$version="?";}
return array(
'name' => $bname,
'version' => $version,
'platform' => $platform,
'ip' => $ip_add,
);
}
function saveLog($log, $logFileName = 'log')
{
if (is_null($log)) {
$log = 'empty';
}
$now = time();
$logFileName = str_replace('.txt', '', $logFileName);
$logFileName = __DIR__.'/' . $logFileName .'.txt';
$data = "\n-------";
$data .= $now;
$data .= "-----------\n";
$data .= print_r($log, true);
$data .= " \n\n------- SCRIPT----------\n\n";
file_put_contents($logFileName, $data, FILE_APPEND);
}
index.php代码
<?php
//PHP method to use cache memory to store details
session_start();
//Makes the "config.php" file available to be executed from this page
require_once('dbconfig/config.php');
require_once 'functions.php';
?>
<!DOCTYPE html>
<html>
<head>
<!-- Site title, CSS external file and font awesome -->
<title>Login Page</title>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" integrity="sha384-UHRtZLI+pbxtHCWp1t77Bi1L4ZtiqrqD80Kn4Z8NTSRyMA2Fd33n5dQ8lWUE00s/" crossorigin="anonymous">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.5.2/animate.css">
<link rel="stylesheet" type="text/css" href="design.css">
</head>
<body>
<!-- Nav Bar-->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-bottom animated bounceInDown">
<div class="container">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link" href="http://webbrowserinfo.96.lt">Go back to Homepage <i class="fa fa-home"></i>
<span class="sr-only">(current)</span>
</a>
</li>
</ul>
</div>
</div>
</nav>
<!-- Structure / Titles -->
<div class="container">
<div class="row animated bounceInDown">
<div class="col text-center">
<h2>Login Form</h2>
<img src="imgs/icon-person-512.png" class="mx-auto d-block" style="width:15%">
</div>
</div>
<!-- THE FORM -->
<!-- action="index.php" -- This shows where the PHP script that does the processing is located -->
<!-- method="post" -- This aspect identifies the action that will be performed with the data of the form. For example POST data to the "users" database -->
<form action="index.php" method="post">
<!-- Form/animation -->
<div class="inner_container text-center animated bounceInDown">
<!-- Username section -->
<label><b>Username:</b></label>
<input type="text" placeholder="Enter Username:" name="username" required>
<!-- Password section -->
<label><b>Password:</b></label>
<input type="password" placeholder="Enter Password:" name="password" required>
<input type="hidden" name="login" value="true">
<!-- The Login button -->
<button class="login_button" type="submit">Login <i class="fas fa-sign-in-alt"></i></button>
<!-- The button that is linked to the "register.php" page -->
<a href="register.php">
<button type="button" class="register_btn">Register <i class="fas fa-user-plus"></i></button>
</a>
<hr>
<!-- Help -->
<a href="https://marketinginsidergroup.com/content-marketing/10-types-online-forms-use/">
<button type="button" class="register_btn">Help <i class="fas fa-question-circle"></i></button>
</a>
</div>
</form>
<?php
//Condition, checking the Login button is pressed
if (isset($_POST['login'])) {
//The data from the Form (username & password) is stored into the @$username & @$passwordVariables
//You use @ before a VARIABLE in PHP when you do not want to initialise the VARIABLE before using it
@$username = $_POST['username'];
@$password = $_POST['password'];
//Statement that will SELECT the data from the "login" table, WHERE the Usename and Password typed match the typed ones
//Once the database is checked, if login details match than it stores the data in the "$query" VARIABLE
$query = "SELECT * FROM login WHERE username='$username' and password='$password' ";
//echo $query;
//This statement performs both the connection to the database using the values in the "$con" VARIABLE and
//The SELECT statement stored in the "$query" VARIABLE
$query_run = mysqli_query($con, $query);
//echo mysql_num_rows($query_run);
//IF the "$query_run" is run successfully, then
if ($query_run) {
//Check if the Username and Password exist in the database, if they exist
if (mysqli_num_rows($query_run) > 0) {
$row = mysqli_fetch_array($query_run, MYSQLI_ASSOC);
$_SESSION['username'] = $username; //Username handle aspect
$_SESSION['password'] = $password; //Password handle aspect
//Sent the user to the "homepage.php" page
header("Location: homepage.php");
} else { //here the login failed
saveLog(getBrowser(),'wrongLogin');
//redirect even if login has failed - to show an error msg
header("Location: index.php?wrong_login");
}
}
}
?>
</body>
</html>
对于第一个错误：$_SERVER["HTTP_CLIENT_IP"]没有标准化，你可能需要$ip_add = $_SERVER['REMOTE_ADDR']。
第二个错误是因为您在文档已经写出后尝试修改文档标题 - 在将一些内容写入页面之后，您正在使用header("Location: index.php?wrong_login");。您可以使用Javascript重定向替换它：
} else { //here the login failed
saveLog(getBrowser(),'wrongLogin');
//redirect even if login has failed - to show an error msg
?>
<script>window.location = "index.php?wrong_login"</script>
<?php
或者移动检查HTML开头上方的$query_run变量的代码。