Form Generate

database
login.php
API Key ADD

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Login with OTP</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-4bw+/aepP/YC94hEpVNVgiZdgIC5+VKNBQNGCHeKRQN+PtmoHDEXuppvnDJzQIu9" crossorigin="anonymous">
  </head>
  <body class="container">
<center><img src="https://i.ibb.co/0M6NRkT/Pngtree-purple-gradient-password-to-unlock-5045253.png" height="250px"><center>

<?php
	if(isset($_REQUEST['smtbtn'])){
		include("dbcon.php");
		
		$phone = mysqli_real_escape_string($con,$_REQUEST['phone']);
		$sql = "SELECT * FROM `user` WHERE `phone` = '$phone'";
		$run = mysqli_query($con,$sql);
		$total = mysqli_num_rows($run);
		if($total===1){
			//otp send
				
				$otp = rand(1000,9999);
						
				$fields = array(
				"variables_values" => $otp,
				"route" => "otp",
				"numbers" => $phone,
				);

$curl = curl_init();

curl_setopt_array($curl, array(
			  CURLOPT_URL => "https://www.fast2sms.com/dev/bulkV2",
			  CURLOPT_RETURNTRANSFER => true,
			  CURLOPT_ENCODING => "",
			  CURLOPT_MAXREDIRS => 10,
			  CURLOPT_TIMEOUT => 30,
			  CURLOPT_SSL_VERIFYHOST => 0,
			  CURLOPT_SSL_VERIFYPEER => 0,
			  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
			  CURLOPT_CUSTOMREQUEST => "POST",
			  CURLOPT_POSTFIELDS => json_encode($fields),
			  CURLOPT_HTTPHEADER => array(
				"authorization: YOUR_API_KEY",
				"accept: */*",
				"cache-control: no-cache",
				"content-type: application/json"
			  ),
			));

$response = curl_exec($curl);
			$err = curl_error($curl);

curl_close($curl);

mysqli_query($con,"UPDATE `user` SET `otp`='$otp' WHERE `phone` = '$phone'");
						
				header("location: otp_check.php?phone=$phone");
			
			
			
			
			
			
			
		}else{
			
			//redirect to registration page
			header("location: registration.php?phone=$phone");
			
			
			
		}
	}
	
	?>

<form action="" method="post">
  <div class="mb-3">
    <label for="exampleInputEmail1" class="form-label fw-bold">Mobile No.</label>
    <input type="number" class="form-control" id="exampleInputEmail1" name="phone" aria-describedby="emailHelp" placeholder="Enter Your Mobile No.">
  </div>
  
  <button type="submit" class="btn btn-primary w-100" name="smtbtn">Submit</button>
</form>
	
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-HwwvtgBNo3bZJJLYd8oVXjrBZt8cqVSpeBNS5n7C8IVInixGAoxmnlMuBnhbgrkm" crossorigin="anonymous"></script>
  </body>
</html>

registration.php
API Key ADD

<?php 
include("dbcon.php");
?>

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Registration - OTP Base</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-4bw+/aepP/YC94hEpVNVgiZdgIC5+VKNBQNGCHeKRQN+PtmoHDEXuppvnDJzQIu9" crossorigin="anonymous">
  </head>
  <body class="container">
  
  
	  <?php 
	  
	  if(isset($_REQUEST['smtbtn'])){
		  
		$name = mysqli_real_escape_string($con,$_REQUEST['name']);  
		$phone = mysqli_real_escape_string($con,$_REQUEST['phone']);  
		$address = mysqli_real_escape_string($con,$_REQUEST['address']);  
		  
		$sql = "INSERT INTO `user`(`name`, `phone`, `address`) VALUES ('$name','$phone','$address')";  
		$run = mysqli_query($con,$sql); 
		if($run==true){
			//otp send
				
				$otp = rand(1000,9999);
			$fields = array(
				"variables_values" => $otp,
				"route" => "otp",
				"numbers" => $phone,
				);

$curl = curl_init();

$response = curl_exec($curl);
			$err = curl_error($curl);

curl_close($curl);

mysqli_query($con,"UPDATE `user` SET `otp`='$otp' WHERE `phone` = '$phone'");
						
				header("location: otp_check.php?phone=$phone");
		}else{
			
			echo "Failed";
		}
		  
		  
		  
	  }
  	  ?>
  
  
   <br/><br/><br/>
	<form action="" method="POST">
  <div class="mb-1">
    <label for="exampleInputEmail1" class="form-label">Name</label>
    <input type="text" class="form-control" id="exampleInputEmail1" name="name" aria-describedby="emailHelp">
  </div>
  <div class="mb-1">
    <label for="exampleInputPassword1" class="form-label">Phone</label>
    <input type="text" class="form-control" name="phone" value="<?php echo $_REQUEST['phone'];?>" id="exampleInputPassword1" readonly>
  </div>
 <div class="mb-1">
    <label for="exampleInputPassword1" class="form-label">Address</label>
    <input type="text" class="form-control" name="address" id="exampleInputPassword1">
  </div>
 
  <button type="submit" class="btn btn-primary w-100" name="smtbtn">Submit</button>
</form>
   
   
   
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-HwwvtgBNo3bZJJLYd8oVXjrBZt8cqVSpeBNS5n7C8IVInixGAoxmnlMuBnhbgrkm" crossorigin="anonymous"></script>
  </body>
</html>

otp_check.php

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>OTP CHECK</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-4bw+/aepP/YC94hEpVNVgiZdgIC5+VKNBQNGCHeKRQN+PtmoHDEXuppvnDJzQIu9" crossorigin="anonymous">
  </head>
  <body class="container">
  
  <img src="https://i.ibb.co/0M6NRkT/Pngtree-purple-gradient-password-to-unlock-5045253.png" class="img-fluid">

<?php
  if(isset($_REQUEST['smtbtn'])){
	  include("dbcon.php");
	  $phone = $_REQUEST['phone'];
	  $otp = $_REQUEST['otp'];
	  
	  $sql = "SELECT * FROM `user` WHERE `phone` = '$phone' AND `otp` = '$otp'";
	  $run = mysqli_query($con,$sql);
	  $total = mysqli_num_rows($run);
	  
	  if($total===1){
		//COOKIE SET & REDIRCT INDEX.PHP
		setcookie("user_phone",$phone, time() + (86400 * 10), "/");
		setcookie("user_otp",$otp, time() + (86400 * 10), "/"); 
		header("location: index.php");  
		  
	  }else{
		  
		  echo "OTP WRONG,TRY AGAIN...";
		  
	  }
	  
  }
  
  
  
  ?>
  
  
  
<form method="post" action="">
  <div class="mb-3">
    <label for="exampleInputEmail1" class="form-label fw-bold">OTP</label>
    <input type="number" class="form-control" name="otp" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter OTP">
  </div>

<button type="submit" class="btn btn-primary w-100" name="smtbtn">Submit</button>
</form>
  
  
  
  
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-HwwvtgBNo3bZJJLYd8oVXjrBZt8cqVSpeBNS5n7C8IVInixGAoxmnlMuBnhbgrkm" crossorigin="anonymous"></script>
  </body>
</html>

header.php