Cannot edit functions.php and any of the website pages anymore on localhost

Question

I've just installed Wordpress 6.4.3 & MAMP and managed to edit functions.php and saved my changes.

Twenty Twenty-Four: Theme Functions (functions.php)

When I tried to make more changes to the file, Wordpress started displaying the following error message:

Something went wrong. Your change may not have been saved. Please try again. There is also a chance that you may need to manually fix and upload the file over FTP.

When I try to edit my website pages, I started getting the following error message now:

Updating failed. The response is not a valid JSON response.

This is what I've added to functions.php successfully and cannot edit it anymore

if ($_SERVER["REQUEST_METHOD"] === "POST") {
  $name = sanitize_text_field($_POST["name"]);
  $email = sanitize_email($_POST["email"]);
  $message = sanitize_textarea_field($_POST["description"]);

  // Add code to save the form data to the database
  global $wpdb;
  $table_name = $wpdb->prefix . 'request_form';
  $data = array(
    'name' => $name,
    'email' => $email,
    'description' => $message,
    'submission_time' => current_time('mysql')
  );
  $insert_result = $wpdb->insert($table_name, $data);

  if ($insert_result === false) {
    $response = array(
      'success' => false,
      'message' => 'Error saving the form data.',
    );
  } else {
    $response = array(
      'success' => true,
      'message' => 'Form data saved successfully.'
    );
  }

  // Return the JSON response
  header('Content-Type: application/json');
  echo json_encode($response);
  exit;
}

What I have done:

• I've checked permissions of the file and gave read and write access to everyone on my localhost.

• Restarted the server

• Moved wordpress to a new folder

• When I changed http to https for wordpress Address (URL) and Site Address (URL) under Settings > General and saved the changes, I was redirected to the following address http://localhost:8888/wp-admin/options.php and can see the following:

  
  Notice: Undefined index: name in /Applications/MAMP/htdocs/wp- content/themes/twentytwentyfour/functions.php on line 209
  
  Notice: Undefined index: email in /Applications/MAMP/htdocs/wp- content/themes/twentytwentyfour/functions.php on line 210
  
  Notice: Undefined index: description in /Applications/MAMP/htdocs/wp- content/themes/twentytwentyfour/functions.php on line 211
  WordPress database error: [Unknown column 'submission_time' in 'field list']
  INSERT INTO `wp_request_form` (`name`, `email`, `description`, `submission_time`) VALUES ('', '', '', '2024-03-30 07:10:51')
  {"success":false,"message":"Error saving the form data."}

Answer 1

To bypass the error message, I've accessed functions.php file in wordpress folder and commented out the last section of my code which is to return JSON response.

After saving the file, I accessed the file on Wordpress and managed to continue editing it!!!!