process.php

<?php
//process.php
if ($_SERVER["REQUEST_METHOD"] == "POST") {//Check it is coming from a form
	$u_email = $_POST["user_email"]; //set PHP variables like this so we can use them anywhere in code below

	
	//print output text
	print "Hello!, we have received email ". $u_email;
	print "We will contact you very soon!";

	
};

// Remove all illegal characters from email
$u_email = filter_var($u_email, FILTER_SANITIZE_EMAIL);

// Validate e-mail
if (filter_var($u_email, FILTER_VALIDATE_EMAIL)) {
	echo("$u_email is a valid email address");
	
	$host ='localhost';
	$dbUsername='root';
	$dbPassword ='';
	$dbname='users_data';

	//connection created here

	$conn = new mysqli($host,$dbUsername,$dbPassword, $dbname);
	if(mysqli_connect_error()){	
		die('connect Error('.myqli_connect_errno().')' . mysqli_connect_error());
	} else{
		$SELECT = "	SELECT email from users_data where email = ? Limit:1";
		$INSERT ="INSERT into users_data (u_email) values (?)";

		$stmt =$conn->prepare($SELECT);
		$stmt ->bind_param("s", $u_email);
		$stmt ->execute();
		$stmt ->bind_result($u_email);
		$stmt ->store_result();
		$rnum = $stmt->num_rows;

		if($rnum ==0) {
			$stmt->close();
			$stmt = $conn->prepare($INSERT);
			$stmt->bind_param( "ssssil", $u_email);
			$stmt->execute();
			echo 'new record succ3ssfully';

		}
		else {
			echo 'someone has this email';
		}
		$stmt->close();
		$conn->close();
	}
} else {
    echo("$u_email is not a valid email address");
}
?>