How to check if email exists with MYSQLi - mysqli

Question

I'm 11 and I'm making a chat site for me and my friends. I'm using MYSQLi to handle the database things, and I'm kinda new to it. I always used normal mysql.
Oh! And if you can share a link to a mysqli tutorial, it would be great :)
Well here's my config file
<?PHP
define("HOST", "localhost"); define("USER", "root"); define("PASSWORD", "****"); define("DATABASE", "secure_login");
$mysqli = new mysqli(HOST, USER, PASSWORD, DATABASE);
?>
The database is secure_login, then I have a table called members, and then a column named email in that table.
I included this to a file (register.php) where I have to check if the email exists or not. And if it exists, redirect to home.
If you guys can help me it would be cool!!! I hope to finish this soon :)

Answer 1

I'd start with reading the MySQLi documentation at http://php.net/manual/en/book.mysqli.php, in specific the methods related to the class. If you are in need of a tutorial I would suggest to search on Google, there are loads of tutorials on the web.
As for your question, something like this should work:
$query = "SELECT email FROM members WHERE USER = ? AND PASS = ?";
if ($stmt = $mysqli->prepare($query)){
// Bind the parameters, these are the ?'s in the query.
$stmt->bind_param("ss", $username, sha1($password));
// Execute the statement
if($stmt->execute()){
// get the results from the executed query
$stmt->store_result();
$email_res= "";
// This stores the value of the emailaddres inside $email_res
$stmt->bind_result($email_res);
$stmt->fetch();
// There is a result
if ($stmt->num_rows == 1){
// Validate the emailadres here, check the PHP function filter_var()
}
else {
// Not a valid email
}
}
else {
printf("Execute error: %s", $stmt->error);
}
}
else {
printf("Prepared Statement Error: %s\n", $mysqli->error);
}
}
I hope this helps