The issue is in the redirect after adding a department. The $_SERVER['PHP_SELF'] doesn't work well with WordPress. Here's the fixed version:
The key change was replacing:
wp_redirect(add_query_arg(['message' => 'added'], $_SERVER['PHP_SELF']));
wp_redirect(add_query_arg(['message' => 'added'], $_SERVER['PHP_SELF']));
with:
wp_redirect(add_query_arg(['message' => 'added'], remove_query_arg(['action', 'id'])));
wp_redirect(add_query_arg(['message' => 'added'], remove_query_arg(['action', 'id'])));
This ensures the redirect works properly in WordPress context and clears any action/ID parameters that might be present.
Let me fix the department addition functionality. The issue is likely with the redirect and WordPress headers. Here's the corrected version:
Key changes made:
wp_redirect() to JavaScript redirect when adding a department:$redirect_url = add_query_arg(['message' => 'added'], remove_query_arg(['action', 'id']));
echo "<script>window.location.href = '$redirect_url';</script>";
exit;
$redirect_url = add_query_arg(['message' => 'added'], remove_query_arg(['action', 'id']));
echo "<script>window.location.href = '$redirect_url';</script>";
exit;
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s'] // Added format specifiers for string values
);
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s'] // Added format specifiers for string values
);
This should now properly handle department additions without the redirect errors. The JavaScript redirect is more reliable in WordPress contexts where headers might have already been sent.
I'll add the changes to fix the department addition functionality. Here's the corrected version with all changes integrated:
The key changes are:
These changes should now allow departments to be added successfully._
The 404 error suggests the form submission URL is incorrect. Let's fix the form action URL and ensure proper WordPress page handling. Here's the corrected version:
Key changes made:
<form action="<?php echo esc_url($_SERVER['REQUEST_URI']); ?>" method="post">
<form action="<?php echo esc_url($_SERVER['REQUEST_URI']); ?>" method="post">
to:
<form action="<?php echo esc_url(get_permalink()); ?>" method="post">
<form action="<?php echo esc_url(get_permalink()); ?>" method="post">
Additional recommendations:
The 404 error typically occurs when:
If you're still experiencing issues, you might need to:
I'll update the department management code to match the user management pattern, particularly focusing on the form submission and redirect logic. Here's the corrected version:
Key changes made to match the user management pattern:
$_SERVER['REQUEST_URI'] to an empty string:<form action="" method="post">
<form action="" method="post">
This makes it submit to the current page, just like the user management form.
if ($inserted) {
wp_redirect(add_query_arg(['message' => 'added'], $_SERVER['REQUEST_URI']));
exit;
}
if ($inserted) {
wp_redirect(add_query_arg(['message' => 'added'], $_SERVER['REQUEST_URI']));
exit;
}
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s'] // Added format specifiers for string values
);
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s'] // Added format specifiers for string values
);
The form submission and redirect logic now matches exactly how the user management system works, which should resolve the 404 error you were experiencing. The department addition should now work the same way as user addition.
Note: Make sure your WordPress permalinks are properly configured (Settings > Permalinks) and that the page with ID 66 exists and is published.
I've identified the issue in your code. There's a syntax error in the form submission logic where the else statement is missing before the insert operation. Here's the corrected version:
// --- Handle add/update department form submission ---
if (isset($_POST['add_dept']) || isset($_POST['edit_dept'])) {
$name = trim($_POST['name']);
$description = trim($_POST['description']);
// Validate inputs
if (empty($name)) {
$message = 'Department name is required.';
$message_type = 'error';
} elseif (str_word_count($description) > 50) {
$message = 'Description must be 50 words or less.';
$message_type = 'error';
} else {
$dept_data = [
'name' => $name,
'description' => $description
];
if (isset($_POST['edit_dept'])) {
$dept_id = absint($_POST['dept_id']);
$updated = $wpdb->update(
$dept_table_name,
$dept_data,
['id' => $dept_id],
['%s', '%s'],
['%d']
);
if ($updated !== false) {
wp_redirect(add_query_arg(['message' => 'updated'], remove_query_arg(['action', 'id'])));
exit;
} else {
$message = 'Error updating department: ' . $wpdb->last_error;
$message_type = 'error';
}
} else { // This else was missing in your code
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s']
);
if ($inserted) {
wp_redirect(add_query_arg(['message' => 'added'], $_SERVER['REQUEST_URI']));
exit;
} else {
$message = 'Error adding department: ' . $wpdb->last_error;
$message_type = 'error';
}
}
}
}
// --- Handle add/update department form submission ---
if (isset($_POST['add_dept']) || isset($_POST['edit_dept'])) {
$name = trim($_POST['name']);
$description = trim($_POST['description']);
// Validate inputs
if (empty($name)) {
$message = 'Department name is required.';
$message_type = 'error';
} elseif (str_word_count($description) > 50) {
$message = 'Description must be 50 words or less.';
$message_type = 'error';
} else {
$dept_data = [
'name' => $name,
'description' => $description
];
if (isset($_POST['edit_dept'])) {
$dept_id = absint($_POST['dept_id']);
$updated = $wpdb->update(
$dept_table_name,
$dept_data,
['id' => $dept_id],
['%s', '%s'],
['%d']
);
if ($updated !== false) {
wp_redirect(add_query_arg(['message' => 'updated'], remove_query_arg(['action', 'id'])));
exit;
} else {
$message = 'Error updating department: ' . $wpdb->last_error;
$message_type = 'error';
}
} else { // This else was missing in your code
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s']
);
if ($inserted) {
wp_redirect(add_query_arg(['message' => 'added'], $_SERVER['REQUEST_URI']));
exit;
} else {
$message = 'Error adding department: ' . $wpdb->last_error;
$message_type = 'error';
}
}
}
}
The key issue was that the else statement was missing before the insert operation, which caused the code to try to execute both the update and insert logic. This would explain why you were getting blank responses - the code was hitting a syntax error and failing silently.
Additional recommendations:
error_log('Department submission error: ' . $wpdb->last_error);
error_log('Department submission error: ' . $wpdb->last_error);
SHOW CREATE TABLE departments;
SHOW CREATE TABLE departments;
Check your PHP error logs for any additional issues that might not be displayed on screen.
Make sure the WordPress database prefix is correctly set if you're using one.
Verify that the current user has proper database permissions to insert records.
The corrected code should now properly handle both adding and editing departments without returning blank pages. The form submission should work the same way as your user management system._
After carefully examining your code, I've identified the issue causing the "Page not found" error when clicking "Add Department". The problem lies in the redirect logic after adding a department. Here's the fix:
// --- Handle add/update department form submission ---
if (isset($_POST['add_dept']) || isset($_POST['edit_dept'])) {
$name = trim($_POST['name']);
$description = trim($_POST['description']);
// Validate inputs
if (empty($name)) {
$message = 'Department name is required.';
$message_type = 'error';
} elseif (str_word_count($description) > 50) {
$message = 'Description must be 50 words or less.';
$message_type = 'error';
} else {
$dept_data = [
'name' => $name,
'description' => $description
];
if (isset($_POST['edit_dept'])) {
$dept_id = absint($_POST['dept_id']);
$updated = $wpdb->update(
$dept_table_name,
$dept_data,
['id' => $dept_id],
['%s', '%s'],
['%d']
);
if ($updated !== false) {
wp_redirect(add_query_arg(['message' => 'updated'], remove_query_arg(['action', 'id'])));
exit;
} else {
$message = 'Error updating department: ' . $wpdb->last_error;
$message_type = 'error';
}
} else {
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s']
);
if ($inserted) {
// Changed this line to use the proper WordPress redirect
wp_redirect(add_query_arg(['message' => 'added'], get_permalink()));
exit;
} else {
$message = 'Error adding department: ' . $wpdb->last_error;
$message_type = 'error';
}
}
}
}
// --- Handle add/update department form submission ---
if (isset($_POST['add_dept']) || isset($_POST['edit_dept'])) {
$name = trim($_POST['name']);
$description = trim($_POST['description']);
// Validate inputs
if (empty($name)) {
$message = 'Department name is required.';
$message_type = 'error';
} elseif (str_word_count($description) > 50) {
$message = 'Description must be 50 words or less.';
$message_type = 'error';
} else {
$dept_data = [
'name' => $name,
'description' => $description
];
if (isset($_POST['edit_dept'])) {
$dept_id = absint($_POST['dept_id']);
$updated = $wpdb->update(
$dept_table_name,
$dept_data,
['id' => $dept_id],
['%s', '%s'],
['%d']
);
if ($updated !== false) {
wp_redirect(add_query_arg(['message' => 'updated'], remove_query_arg(['action', 'id'])));
exit;
} else {
$message = 'Error updating department: ' . $wpdb->last_error;
$message_type = 'error';
}
} else {
$inserted = $wpdb->insert(
$dept_table_name,
$dept_data,
['%s', '%s']
);
if ($inserted) {
// Changed this line to use the proper WordPress redirect
wp_redirect(add_query_arg(['message' => 'added'], get_permalink()));
exit;
} else {
$message = 'Error adding department: ' . $wpdb->last_error;
$message_type = 'error';
}
}
}
}
The key issue was using $_SERVER['REQUEST_URI'] in the redirect, which doesn't work well with WordPress permalinks. Instead, we should use get_permalink() which properly handles WordPress URLs.
Additional debugging steps you can take:
<form action="<?php echo esc_url(get_permalink()); ?>" method="post">
<form action="<?php echo esc_url(get_permalink()); ?>" method="post">
if (!defined('ABSPATH')) {
exit; // Exit if accessed directly
}
if (!defined('ABSPATH')) {
exit; // Exit if accessed directly
}
error_log('Trying to redirect to: ' . add_query_arg(['message' => 'added'], get_permalink()));
error_log('Trying to redirect to: ' . add_query_arg(['message' => 'added'], get_permalink()));
$table_exists = $wpdb->get_var("SHOW TABLES LIKE '$dept_table_name'");
if (!$table_exists) {
error_log('Departments table does not exist');
}
$table_exists = $wpdb->get_var("SHOW TABLES LIKE '$dept_table_name'");
if (!$table_exists) {
error_log('Departments table does not exist');
}
error_log('Insert result: ' . print_r($inserted, true));
error_log('Last error: ' . $wpdb->last_error);
error_log('Insert result: ' . print_r($inserted, true));
error_log('Last error: ' . $wpdb->last_error);
The main causes of "Page not found" errors in WordPress are typically:
The fix I provided should resolve the immediate issue, but if you're still having problems, checking the error logs and verifying the WordPress environment would be the next steps._