因此，评论系统可以正常工作，我尝试放置不同的articlecID，并为特定文章添加了评论。现在，我想在添加注释时对它自己发布的“ Microsoft”文章说，而无需在查询中添加ID。如果您不理解我要做什么，可以说我想隐式而不是显式地执行此操作：
$query = "INSERT INTO comments (comment, name, articlecID) VALUES ('$comment', '$username', 1)
现在我要在查询中使用'$ articlecID'变量而不是数字'1'。
我试图从HTML内的隐藏字段中获取数据，并像这样将其放入PHP：
$articlecID = e($_POST['articlecID']);
我也尝试输入ID，但是什么也没有。任何人都可以解决此问题吗？
<?php
# Starting session. #
session_start();
# Starting session. #
# Connection to database. #
$db = mysqli_connect('127.0.0.1:3305', 'root', '', 'assignmentnews');
# Connection to database. #
# Let's declare some variables. #
$username = "";
$errors = array();
# Let's declare some variables. #
# Call the register() function if register_btn is clicked. #
if(isset($_POST['register_btn']))
{
register();
}
# Call the register() function if register_btn is clicked. #
# Register function. #
function register()
{
# Let's use here 'global' keyword to make these declared variables available outside function. #
global $db, $errors, $username;
# Let's use here 'global' keyword to make these declared variables available outside function. #
# Recieve all input values from the form. Let's call e() / escape string function. #
$username = e($_POST['username']);
$password_01 = e($_POST['pwd']);
$password_02 = e($_POST['pwd-confirmation']);
# Recieve all input values from the form. Let's call e() / escape string function. #
# Form validation. Let's make sure that form is correctly filled. #
if(empty($username)) { array_push($errors, "Username is required."); }
if(!preg_match("/^[a-zA-Z0-9]*$/", $username)) { array_push($errors, "Invalid characters in username field."); }
if(empty($password_01)) { array_push($errors, "Password field can't be empty."); }
if(empty($password_02)) { array_push($errors, "Re-entering password field can't be empty, either."); }
# Form validation. Let's make sure that form is correctly filled. #
# Let's register user if there are no errors inside form. #
if(count($errors) == 0)
{
# Encrypt password before storing it inside database. #
$password = md5($password_01);
# Encrypt password before storing it inside database. #
if(isset($_POST['usertype']))
{
$usertype = e($_POST['usertype']);
$query = "INSERT INTO users (username, pwd, usertype) VALUES ('$username', '$password', '$usertype')";
mysqli_query($db, $query);
$_SESSION['success'] = "New user successfully created.";
header("Location: ../registration/login.php");
}
else
{
$query = "INSERT INTO users (username, pwd, usertype) VALUES ('$username', '$password', 'user')";
mysqli_query($db, $query);
# Let's get ID of the created user. #
$logged_in_user_ID = mysqli_insert_id($db);
# Let's get ID of the created user. #
# Let's put logged in user in session. #
$_SESSION['user'] = getUserById($logged_in_user_ID);
$_SESSION['success'] = "You are now logged in.";
header("Location: ../user.php?loggedIn");
# Let's put logged in user in session. #
}
}
# Let's register user if there are no errors inside form. #
}
# Function for getting users ID. #
function getUserById($id)
{
global $db;
$query = "SELECT * FROM users WHERE id=" . $id;
$result = mysqli_query($db, $query);
$user = mysqli_fetch_assoc($result);
return $user;
}
# Function for getting users ID. #
# Escape string function. #
function e($val)
{
global $db;
return mysqli_real_escape_string($db, trim($val));
}
# Escape string function. #
# Register function. #
# Display error function. #
function display_error()
{
global $errors;
if(count($errors) > 0)
{
echo '<div class="error">';
foreach($errors as $error)
{
echo $error . '<br>';
}
echo '</div>';
}
}
# Display error function. #
# Let's make an algorithm when person types url like: user.php into browser they are unable to access page if not logged in. #
function isLoggedIn()
{
if(isset($_SESSION['user']))
{
return true;
}
else
{
return false;
}
}
# Let's make an algorithm when person types url like: user.php into browser they are unable to access page if not logged in. #
# Let's make an function if user click logout button, logout action happens. #
if(isset($_GET['logout']))
{
session_destroy();
unset($_SESSION['user']);
header("Location: login.php");
}
# Let's make an function if user click logout button, logout action happens. #
# Let's call the login() function if the login button is clicked. #
if(isset($_POST['login_user']))
{
login();
}
function login()
{
# Let's use here 'global' keyword to make these declared variables available outside function. #
global $db, $username, $errors;
# Let's use here 'global' keyword to make these declared variables available outside function. #
# Recieve all input values from the form. Let's call e() / escape string function. #
$username = e($_POST['username']);
$password = e($_POST['pwd']);
# Recieve all input values from the form. Let's call e() / escape string function. #
# Form validation. Let's make sure that form is correctly filled. #
if(empty($username)) { array_push($errors, "Username field is required. It can't be empty."); }
if(!preg_match("/^[a-zA-Z0-9]*$/", $username)) { array_push($errors, "Invalid characters in username field."); }
if(empty($password)) { array_push($errors, "Password field is required. It can't be empty."); }
# Form validation. Let's make sure that form is correctly filled. #
# Let's attempt login if there are no errors on form. #
if(count($errors) == 0)
{
$password = md5($password);
$query = "SELECT * FROM users WHERE username='$username' AND pwd='$password'";
$results = mysqli_query($db, $query);
# User found. #
if(mysqli_num_rows($results) == 1)
# User found. #
{
# Let's check if person is admin or user. #
$logged_in_user = mysqli_fetch_assoc($results);
if($logged_in_user['usertype'] == 'admin')
{
$_SESSION['user'] = $logged_in_user;
$_SESSION['success'] = "You are logged in as admin.";
header("Location: ../admin.php");
}
else
{
$_SESSION['user'] = $logged_in_user;
$_SESSION['success'] = "You are now logged in as user.";
header("Location: ../user.php");
}
# Let's check if person is admin or user. #
}
else
{
array_push($errors, "Wrong username/password combination.");
}
}
# Let's attempt login if there are no errors on form. #
}
# Let's call the login() function if the login button is clicked. #
# Let's add isAdmin function. #
function isAdmin()
{
if(isset($_SESSION['user']) && $_SESSION['user']['usertype'] == 'admin')
{
return true;
}
else
{
return false;
}
}
# Let's add isAdmin function. #
# Algorithm for saveChanges button-submit. #
if(isset($_POST['saveChanges']))
{
saveChangesArticle();
}
# Algorithm for saveChanges button-submit. #
# Save changes function. #
function saveChangesArticle()
{
global $db, $errors;
$headline = e($_POST['headline']);
$storyline = e($_POST['storyText']);
$authorUsername = e($_POST['authorUser']);
$timestampDate = e($_POST['date']);
if(empty($headline)) { array_push($errors, "Headline / Title field is required."); }
if(empty($storyline)) { array_push($errors, "Storyline / Text field is required."); }
if(empty($authorUsername)) { array_push($errors, "Author / Username field is required."); }
if(empty($timestampDate)) { array_push($errors, "Date field is required."); }
if(count($errors) == 0)
{
$query = "INSERT INTO newsmodule (headline, storyline, username, timestamp)
VALUES ('$headline', '$storyline', '$authorUsername', '$timestampDate')";
mysqli_query($db, $query);
header("Location: admin.php?ArticleAddedSuccessfully");
exit();
}
else
{
echo("Error: Creating article failed.");
}
}
# Save changes function. #
# Function for viewing news. #
function viewNews()
{
global $db;
$query = "SELECT * FROM newsmodule ORDER BY timestamp";
$result = mysqli_query($db, $query);
if (!$result)
{
echo "Error selecting headline from database.";
exit();
}
if (mysqli_num_rows($result) > 0)
{
echo "<div style='margin-left: 0; width: 100%;' class='jumbotron'>";
while ($row = mysqli_fetch_object($result))
{
echo "<h1><br>" . $row->headline . "</h1>";
echo "<hr>";
echo "<p>" . $row->storyline . "</p>";
echo "<hr>";
echo "<h5 class='pull-right'>" . $row->username . "</h5>";
echo "<p>" . $row->timestamp . "</p>";
echo "<hr>";
echo showCommentArea($row->id);
echo "<a data-target='#postComment' class='text-white dropdown-toggle btn btn-danger' data-toggle='modal' type='button'>";
echo "Publish a Comment";
echo "</a>";
}
echo "</div>";
}
else
{
echo "No headlines in database.";
}
}
# Function for inserting comments. #
function addComment()
{
global $db, $errors, $username;
$comment = $_POST['comment-text'];
$username = $_POST['commenter-username'];
$articlecID = $_POST['articlecID']; # Getting value from input name attr #
if(count($errors) == 0)
{
$query = "INSERT INTO comments (comment, name, articlecID)
VALUES ('$comment', '$username', '$articlecID')";
mysqli_query($db, $query);
header("Location: ./admin.php?successMessage");
}
}
# Function for inserting comments. #
# Function for joining tables. #
# Function for joining tables. #
if(isset($_POST['saveChanges02'])){
addComment();
}
# Post comment function. #
function showCommentArea($id)
{
global $db, $errors, $username;
if(count($errors) == 0)
{
$query = "SELECT comment, name FROM comments
INNER JOIN newsmodule ON comments.articlecID=newsmodule.id WHERE $id = newsmodule.id";
$result = mysqli_query($db, $query);
if(!$result)
{
echo "SQL Query ERROR: !ERR_SQL_QUERY_01";
exit();
}
if (mysqli_num_rows($result) > 0) {
echo "<div>";
echo "<h4>";
echo "Comments:";
echo "</h4>";
echo "<br>";
while ($row = mysqli_fetch_object($result)) {
echo "<p class='text-danger' style='font-weight: bold;'>" . $row->name . "</p>";
echo "<p>" . $row->comment . "</p>";
}
echo "</div>";
}
}
}
# Post comment function. #
HTML:
<article class="news-review">
<header>
<table>
<tr>
<td><p><?php viewNews(); ?>
<div class="modal fade" id="postComment" tabindex="-1" role="dialog" aria-labelledby="postCommentLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="postCommentLabel">Post a Comment</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form method="post" action="admin.php">
<div class="form-group">
<label>Comment Text Area</label>
<textarea name="comment-text" class="form-control" placeholder="Comment Text"></textarea>
</div>
<div class="form-group">
<label>Commenter Username</label>
<input type="text" name="commenter-username" class="form-control">
</div>
<div class="form-group">
<input type="hidden" name="articlecID" class="form-control">
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="submit" name="saveChanges02" class="btn btn-danger">Save changes</button>
</div>
</form>
</div>
</div>
</div>
</p></td>
</tr>
<tbody>
<tr>
</tr>
</tbody>
</table>
</header>
</article>
我希望当我点击文章内的发布注释时，它会在newsmodule表中发布并添加新的ID（用于文章的表），并在评论表中添加新的外键（在评论表中的articlecID）用于文章的表。谢谢！
编辑： 在这里：
$query = "INSERT INTO comments (comment, name, articlecID) VALUES ('$comment', '$username', '')";
在空字段中，我尝试从其他表中放入一列，但是什么也没有。 像这样：
$query = "INSERT INTO comments (comment, name, articlecID) VALUES ('$comment', '$username', 'newsmodule.id')";
答案 0 :(得分：0)
$query = "INSERT INTO comments (comment, name, articlecID) VALUES ('$comment', '$username', (SELECT id from newsmodule where ....))";