<?php
// Assuming you have an SMS service provider that can send and receive messages
// and has an API that can be accessed with the following functions:
// send_sms($to, $message) - sends an SMS message to a phone number
// receive_sms() - returns an array of incoming SMS messages with the fields 'from' and 'body'
// Define some constants for the verification process
define('CODE_LENGTH', 6); // the length of the verification code
define('CODE_EXPIRY', 300); // the time in seconds for the code to expire
define('MAX_ATTEMPTS', 3); // the maximum number of attempts to enter the code
// Start a session to store the verification data
session_start();
// Check if the user has submitted a phone number
if (isset($_POST['phone'])) {
// Sanitize and validate the phone number
$phone = filter_var($_POST['phone'], FILTER_SANITIZE_NUMBER_INT);
if (filter_var($phone, FILTER_VALIDATE_INT)) {
// Generate a random verification code
$code = random_int(10 ** (CODE_LENGTH - 1), (10 ** CODE_LENGTH) - 1);
// Store the code, phone number, expiry time, and attempt count in the session
$_SESSION['code'] = $code;
$_SESSION['phone'] = $phone;
$_SESSION['expiry'] = time() + CODE_EXPIRY;
$_SESSION['attempts'] = 0;
// Send the code to the phone number via SMS
send_sms($phone, "Your verification code is: $code");
// Display a form to enter the code
, if you want me to continue , hire me!