mysqli/mysql query inside function not working

Question

I\'m tryin to build some functions for a website of mine and some of them consist in fetching data from the mysql database. When I test the code outside of the function it s

Answer 1

You probably need to use the global keyword, otherwise $db is considered a var in local scope.

function sanitize ($data){
    global $db;
    $db->mysqli_real_escape_string($data);
}

function user_exists($usermail){
    global $db;
    $usermail = sanitize($usermail);
    $query = $db->query("SELECT COUNT(userId) FROM users WHERE userEmail= '$usermail' ");
    $check = $query->num_rows;
    return ($check == 1) ? true : false;
}

Answer 2

Try to connect inside the function, and connection needs to be included before you include functions.

Something like this:

function user_exists($usermail){
    $db = new MySQLi("localhost","test","test","test");
    $usermail = sanitize($usermail);
    $query = $db->query("SELECT COUNT(userId) FROM users WHERE userEmail= '$usermail' ");
    $check = $query->num_rows;
    return ($check == 1) ? true : false;
}