new_subject将信息传递给create_subject以创建新主题。我已将表单设置为将manage_content重定向到成功，如果成功，则保留在new_subject。由于我卡在new_subject.php上，这可能意味着PHP表单在某处失败了。
功能
<?php
function confirm_query($result_set) {
if (!$result_set) {
die("Database query failed: ".
mysqli_connect_error() .
" (" . mysqli_connect_errno(). ")"
);
}
}
function redirect_to($new_location) {
header("Location: " . $new_location);
exit;
}
function mysql_prep($string) {
global $connection;
$escaped_string = mysqli_real_escape_string($connection, $string);
return $escaped_string;
}
function find_all_subjects() {
global $connection;
$query = "SELECT * ";
$query .= "FROM subjects ";
$query .= "ORDER BY position ASC";
$subject_set = mysqli_query($connection, $query);
confirm_query($subject_set);
return $subject_set;
}
function find_all_pages_for_subject($subject_id) {
global $connection;
$safe_subject_id = mysqli_real_escape_string($connection,
$subject_id);
$query = "SELECT * ";
$query .= "FROM pages ";
$query .= "WHERE subject_id = {$safe_subject_id} ";
$query .= "ORDER BY position ASC";
$page_set = mysqli_query($connection, $query);
confirm_query($page_set);
return $page_set;
}
function find_subject_by_id($subject_id) {
global $connection;
$safe_subject_id = mysqli_real_escape_string($connection,
$subject_id);
$query = "SELECT * ";
$query .= "FROM pages ";
$query .= "WHERE id = {$subject_id} ";
$query .= "LIMIT 1";
$subject_set = mysqli_query($connection, $query);
confirm_query($subject_set);
if($subject = mysqli_fetch_assoc($subject_set)) {
return $subject;
} else {
return null;
}
}
function find_page_by_id($page_id) {
global $connection;
$safe_page_id = mysqli_real_escape_string($connection,
$page_id);
$query = "SELECT * ";
$query .= "FROM pages ";
$query .= "WHERE id = {$page_id} ";
$query .= "LIMIT 1";
$page_set = mysqli_query($connection, $query);
confirm_query($page_set);
if($page = mysqli_fetch_assoc($page_set)) {
return $page;
} else {
return null;
}
}
function find_selected_page() {
global $current_subject;
global $current_page;
if (isset($_GET["subject"])) {
$current_subject = find_subject_by_id($_GET["subject"]);
$current_page = null;
} elseif (isset($_GET["page"])) {
$current_subject = null;
$current_page = find_page_by_id($_GET["page"]);
} else {
$current_subject = null;
$current_page = null;
}
}
//navigation takes 2 arguements
// the currently subject array or null
//the currently selected page array or null
function navigation($subject_array, $page_array) {
$output = "<ul class=\"subjects\">";
//2. Perform database query to find all subjects through
// functions page
$subject_set = find_all_subjects();
//3 Use returned data (if any)
while($subject = mysqli_fetch_assoc($subject_set)) {
$output .= "<li";
if ($subject_array && $subject["id"] == $subject["id"]) {
$output .= " class=\"selected\"";
}
$output .= ">";
$output .= "<a href=\"manage_content.php?subject=";
$output .= urlencode($subject["id"]);
$output .= "\">";
$output .= $subject["menu_name"];
$output .= "</a>";
//2. Perform database query by going to functions and
// finding all pages
$page_set = find_all_pages_for_subject($subject["id"]);
$output .= "<ul class=\"pages\">";
//3 Use returned data (if any)
while($page = mysqli_fetch_assoc($page_set)) {
$output .= "<li";
if ($page_array && $page["id"] == $page_array) {
$output .= " class=\"selected\"";
}
$output .= ">";
$output .= "<a href=\"manage_content.php?page=";
$output .= urlencode($page["id"]);
$output .="\">";
$output .= $page["menu_name"];
$output .= "</a></li>";
}
//4. Release returned data
mysqli_free_result($page_set);
$output .= "</ul></li>";
}
//4. Release returned data
mysqli_free_result($subject_set);
$output .= "</ul>";
return $output;
}
?>
manage_content
<?php require_once("includes/session.php"); ?>
<?php require_once("includes/db_connection.php"); ?>
<?php require_once("includes/functions.php"); ?>
<?php include("header.php");?>
<?php find_selected_page(); ?>
<div id ="main">
<div id ="navigation">
<?php
// parse the navigation section that i sent into functions.php
echo navigation($current_subject, $current_page); ?>
<?php
/*
<ul class="subjects">
<?php
//2. Perform database query to find all subjects through
// functions page
$subject_set = find_all_subjects(); ?>
<?php
//3 Use returned data (if any)
while($subject = mysqli_fetch_assoc($subject_set)) {
?>
<?php
echo "<li";
if ($subject["id"] == $selected_subject_id) {
echo " class=\"selected\"";
}
echo ">";
?>
<a href="manage_content.php?subject=<?php echo
urlencode($subject["id"]); ?>"><?php echo $subject["menu_name"]; ?> </a>
<?php
//2. Perform database query by going to functions and
// finding all pages
$page_set = find_all_pages_for_subject($subject["id"]); ?>
<ul class="pages">
<?php
//3 Use returned data (if any)
while($page = mysqli_fetch_assoc($page_set)) {
?>
<?php
echo "<li";
if ($page["id"] == $selected_page_id) {
echo " class=\"selected\"";
}
echo ">";
?>
<a href="manage_content.php?page=<?php echo
urlencode($page["id"]); ?>"><?php echo $page["menu_name"]; ?></a>
</li>
<?php
}
?>
<?php
//4. Release returned data
mysqli_free_result($page_set);?>
</ul>
</li>
<?php
}
?>
<?php
//4. Release returned data
mysqli_free_result($subject_set);?>
</ul>
*/
?>
<br />
<a href="new_subject.php">+ Add a subject</a>
</div>
<div id="page">
<?php echo message();?>
<?php if ($current_subject) { ?>
<h2> Manage Subject</h2>
<?php /*
the current_subject parse in the selected subject ID to the
subject id values inside the functions
next echo out the content of each page
*/?>
Content: <?php echo $current_subject["content"]; ?><br />
<?php } elseif ($current_page) { ?>
<h2>Manage Page</h2>
Content: <?php echo $current_page["content"]; ?><br />
<?php } else { ?>
Please selected a subject or a page.
<?php }?>
</div>
</div>
<?php include("includes/footer.php");?>
new_subject
<?php require_once("includes/session.php"); ?>
<?php require_once("includes/db_connection.php"); ?>
<?php require_once("includes/functions.php"); ?>
<?php include("header.php");?>
<?php find_selected_page(); ?>
<div id ="main">
<div id ="navigation">
<?php
// parse the navigation section that i sent into functions.php
echo navigation($current_subject, $current_page); ?>
<?php
/*
<ul class="subjects">
<?php
//2. Perform database query to find all subjects through
// functions page
$subject_set = find_all_subjects(); ?>
<?php
//3 Use returned data (if any)
while($subject = mysqli_fetch_assoc($subject_set)) {
?>
<?php
echo "<li";
if ($subject["id"] == $selected_subject_id) {
echo " class=\"selected\"";
}
echo ">";
?>
<a href="manage_content.php?subject=<?php echo
urlencode($subject["id"]); ?>"><?php echo $subject["menu_name"]; ?> </a>
<?php
//2. Perform database query by going to functions and
// finding all pages
$page_set = find_all_pages_for_subject($subject["id"]); ?>
<ul class="pages">
<?php
//3 Use returned data (if any)
while($page = mysqli_fetch_assoc($page_set)) {
?>
<?php
echo "<li";
if ($page["id"] == $selected_page_id) {
echo " class=\"selected\"";
}
echo ">";
?>
<a href="manage_content.php?page=<?php echo
urlencode($page["id"]); ?>"><?php echo $page["menu_name"]; ?></a>
</li>
<?php
}
?>
<?php
//4. Release returned data
mysqli_free_result($page_set);?>
</ul>
</li>
<?php
}
?>
<?php
//4. Release returned data
mysqli_free_result($subject_set);?>
</ul>
*/
?>
</div>
<div id="page">
<?php echo message();?>
<h2>Create Subject</h2>
<form action="create_subject.php" method="post">
<p>Subject name:
<input type="text" name="menu_name" value="" />
</p>
<p>Position:
<select name="position">
<?php
$subject_set = find_all_subjects();
$subject_count = mysqli_num_rows($subject_set);
for($count=1; $count <= ($subject_count + 1); $count++) {
echo "<option value=\"{$count}\">{$count}</option>";
}
?>
</select>
</p>
<input type="submit" value="Create Subject" />
</form>
<br />
<a href="manage_content.php">Cancel</a>
</div>
</div>
<?php include("includes/footer.php");?>
create_subject
<?php require_once("includes/session.php"); ?>
<?php require_once("includes/db_connection.php"); ?>
<?php require_once("includes/functions.php"); ?>
<?php
if (isset($_POST['submit'])) {
// Process the form
$menu_name = mysql_prep($_POST["menu_name"]);
$position = (int) $_POST["position"];
// 2. Perform database query
$query .= "INSERT INTO subjects (";
$query .= " menu_name, position";
$query .= ") VALUES (";
$query .= " '{$menu_name}', {$position}";
$query .= ")";
$result = mysqli_query($connection, $query);
if ($result) {
// Success
$_SESSION["message"] = "Subject created.";
redirect_to("manage_content.php");
} else {
// Failure
$_SESSION["message"] = "Subject creation failed.";
redirect_to("new_subject.php");
}
} else {
// This is probably a GET request
redirect_to("new_subject.php");
}
?>
<?php
if (isset($connection)) { mysqli_close($connection); }
?>
答案 0 :(得分：1)
好的，我发现了错误。我关注的视频忘了把名字=“提交”放在表格中，这就是为什么它没有提交。它现在正常运作。谢谢大家的投入，它帮助了我=）。