Naive Bayes Classifier

Implementing Naive Bayes Classification algorithm into PHP to classify given text as ham or spam using MySql database.

How to use

<?php

    require_once('NaiveBayesClassifier.php');

    $classifier = new NaiveBayesClassifier();
    $spam = Category::$SPAM;
    $ham = Category::$HAM;

    $classifier -> train('Have a pleasurable stay! Get up to 30% off + Flat 20% Cashback on Oyo Room' . 
            ' bookings done via Paytm', $spam);
    $classifier -> train('Lets Talk Fashion! Get flat 40% Cashback on Backpacks, Watches, Perfumes,' .
            ' Sunglasses & more', $spam);

    $classifier -> train('Opportunity with Product firm for Fullstack | Backend | Frontend- Bangalore', $ham);
    $classifier -> train('Javascript Developer, Fullstack Developer in Bangalore- Urgent Requirement', $ham);

    $category = $classifier -> classify('Scan Paytm QR Code to Pay & Win 100% Cashback');
    echo $category; // spam
    
    $category = $classifier -> classify('Re: Applying for Fullstack Developer');
    echo $category; // ham

?>

How to install the project-

1. Download the project and extract zip.

2. Create database in MySql-

   1. mysql> create database naiveBayes;
   2. mysql> use naiveBayes;
   3. mysql> create table trainingSet (S_NO integer primary key auto_increment, document text, category varchar(255));
   4. mysql> create table wordFrequency (S_NO integer primary key auto_increment, word varchar(255), count integer, category varchar(255));

3. Open a terminal and move to project folder

4. Edit database connection info in db_connect.php file

5. Execute main.php php main.php

Database Schema

Blog

https://medium.com/@varunon9/classify-emails-into-ham-and-spam-using-naive-bayes-classifier-ffddd7faa1ef

For any bug/mistake you can create github issue. Contact varunon9@gmail.com for suggestion/query.