officerVerificationCodeSendProcess.php

<?php
require "connection.php";

require "SMTP.php";
require "PHPMailer.php";
require "Exception.php";

use PHPMailer\PHPMailer\PHPMailer;

if(isset($_POST["username"])){
    $username = $_POST["username"];

    $officerResultset = Database::search("SELECT * FROM `teacher` WHERE `username`='".$username."'");
    $officerRownumber = $officerResultset->num_rows;

    if($officerRownumber == 1){
        $officerData = $officerResultset->fetch_assoc();

        function generateUniqId($startNum, $idLenght)
        {
            $uniqId = uniqid();
            $newUniqId = substr($uniqId, intval($startNum), intval($idLenght));
            return $newUniqId;
        }
        $verificationCode = generateUniqId(5,6);
        Database::insertUpdateDelete("UPDATE `teacher` SET `verification_code`='".$verificationCode."' WHERE `username`='".$username."'");

        $mail = new PHPMailer;
            $mail->IsSMTP();
            $mail->Host = 'smtp.gmail.com';
            $mail->SMTPAuth = true;
            $mail->Username = '';
            $mail->Password = '';
            $mail->SMTPSecure = 'ssl';
            $mail->Port = 465;
            $mail->setFrom('', 'OSMS');
            $mail->addReplyTo('', 'OSMS');
            $mail->addAddress($officerData["email"]);
            $mail->isHTML(true);
            $mail->Subject = 'Academic Officer Signin Verification Code';
            $bodyContent = '<div style="width: auto;height: auto;border-radius: 24px;background-image: linear-gradient(24deg, #3972eb, #59ccfa);padding-left: 20px;padding-right: 20px;padding-bottom: 20px;">
            <div style="text-align: center;font-size: 13px;font-weight:bold;padding-top:13px;">
                <span style="color: #fff;font-size:18px;">Verification Code Is</span>
            </div>
            <div style="margin-top: 30px;">
                <div style="padding-left:5px;padding-top:5px;padding-bottom:5px;padding-right:5px;border-radius: 24px;background-color: rgb(232, 255, 253);box-shadow: 0px 3px 5px 1px rgba(17, 14, 68, 0.1);text-align:center;">
                    <h3 style="font-size: 14px;color: #135eff;">' . $verificationCode . '</h3>
                </div>
            </div>
        </div>';
            $mail->Body = $bodyContent;

            if (!$mail->send()) {
                echo ("Verification code sending failed");
            } else {
                echo ("success");
            }
    }else{
        echo("Invalid teacher");
    }
}else{
    echo("Something went wrong");
}