Here is a list of all files with brief descriptions:

approve-admin_rights.php	This script handles the approval of a user request for admin rights by updating the value of `admin` column in users database
authFailurePopUp.php	Script for dynamically constructing the error message interface and content according to the error context taken as a GET request parameter
confirm-publish.php	This script handles the approval of publishing of the particular insertion gived by website administrators. Upadates insertion status from "waiting" to "published"
connection.php	This file handles the default database connection. Is imported in all the scripts that require one
decline-admin_rights.php	This script handles the decline of user requests for admin rights by updating the value of `admin` column in users database
delete_insertion.php	This script handles the deletion of the particular insertion from the database by website admins or insertion owners
editdata.php	Form for user data editing
get_admin_rights_requests.php	This script executes retrieving and displaying of the user requests for admin rights with options to aprrove or decline them
get_insertions.php	This script executes retrieving and displaying insertions to the user in various modes according to the parameters of GET request
get_makes.php	This script retrieves the unqiue values of the 'make' column of the 'models' table and sends them as .json response
get_models.php	This script retrieves the values of the 'model' column of the 'models' table according to 'make' parameter of the GET request and sends them back as .json response
getDataErrorPopup.php	Script for dynamically constructing the error message interface and content according to the error context taken as a GET request parameter
header.php	Script for dispaying the page header. Most of the buttons are displayed and available to user according to his authorization status ('user_id' and 'admin' parameters of $_SESSION)
index.php	Script for displaying the main website page. Includes components. Displays error message pop-up in case of error context parameter set in GET request
insertion.php	This script handles retrieving of detailed data of the particular insertion from the database and displaying it as a separate page with some insertion management interface provided for the authorized users
login.php	Form for user login
myprofile.php	This scripts handles displaying user his profile with some account managing interface
process-accountDelete.php	This script handles the deletion of the user account initiated by the user himself
process-adminRightsRequest.php	This script handles reflecting in the database the fact that the user has requested for the admin rights
process-editdata.php	This script provides validation of user editdata form inputs and updating user data in the database in case of successful validation
process-login.php	This script provides validation of user login form inputs, comparison of user authorization data from the input with the one set in the database for this user, and starting a session with set parameters of 'user_id' and 'admin'
process-logout.php	This script handles logout initiated by the user. Unsets and destroys session, clears cookies, redirects back to the main page
process-publishInsertion.php	This script provides validation of inputs of user publish-insertion form, including the attached files
process-register.php	This script provides validation of user registration form inputs, saving new user data to the database in case of successful validation and starting a session for the new user
publish-insertion.php	Form for posting the insertion
register.php	Form for user registration
searchbar.php	This script handles the display and behaviour of the searchbar for the user detailed search among the exisiting insertions by make and model