PHP implements online evaluation system

With the development of computer technology, programming has increasingly become a common need for people. Whether you are a student or a professional programmer, writing code is an important part of your job. The online evaluation system is an important tool for testing the correctness and efficiency of programming. PHP can help us achieve this function. This article will introduce how to use PHP to implement an online evaluation system.

1. System Architecture

The architectural design of the online evaluation system is very important. This system adopts a three-layer architecture design, including the display layer, business logic layer and data access layer. Among them, the presentation layer is the part visible to users, the business logic layer contains the logic for processing user-submitted questions and returning results, and the data access layer is responsible for the storage and access of data.

2. Implementation process

2.1 Create database

First, we need to create the database. The database contains multiple tables, including information such as question content, test data, and user-submitted codes. In this system, we use the MySQL database, refer to the MySQL statement below.

CREATE DATABASE OnlineJudge DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

CREATE TABLE Problem (
id int( 11) NOT NULL AUTO_INCREMENT,
title varchar(128) NOT NULL,
description text NOT NULL,
input text NOT NULL ,
output text NOT NULL,
sample_input text NOT NULL,
sample_output text NOT NULL,
hint text NOT NULL,
time_limit int(11) NOT NULL,
memory_limit int(11) NOT NULL,
PRIMARY KEY ( id)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

CREATE TABLE Solution (
id int(11) NOT NULL AUTO_INCREMENT,
problem_id int(11) NOT NULL,
user_id int(11) NOT NULL,
code text NOT NULL,
result varchar(32) NOT NULL,
create_time datetime NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

2.2 User login and registration page

User login and registration page are indispensable components. In PHP, we can use forms and databases to implement these two pages. User registration information will be stored in the database for subsequent verification of user login information.

2.3 Question list page

In the question list page, we display all questions and some basic information, such as question difficulty, pass rate, etc. Users can click on the topic title to enter the topic display page.

2.4 Question display page

In the question display page, we display the detailed information of this question, including question description, input and output format, sample and submission form, etc.

2.5 Submit form page

After the introduction on the above page, we can enter the core module of this system-submit form page. In this page, users can submit code and select programming languages ​​and recognition intervals, among other things. At this time, PHP will pass the code and test data submitted by the user to the evaluation machine and wait for the feedback results.

2.6 Evaluation page

The evaluation page is a display page of evaluation results, including ratings, time and memory usage, etc. PHP will obtain the latest results submitted by the user from the database and display them to the user.

3. Online testing

After developing the entire system, we need to put the system online and test it. At this point we need to simulate multiple user logins and submit code to verify the performance and security of the system. After confirming that the system is operating normally, it can be publicly used.

Conclusion

This article introduces how to use PHP to implement an online evaluation system, from database design to implementation of page functions, covering all major aspects of system development. Of course, you can modify and modify it according to your actual needs to achieve a more perfect online evaluation system.

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