Warning: mysqli_real_escape_string() expects exactly 2 parameters, 1 given… what i do wrong?

Question

I try make php login but i get this error: Warning: mysqli_real_escape_string() expects exactly 2 parameters, 1 given, what I do wrong?

register.php

Answer 1

mysqli_real_escape_string function requires the connection to your database.

$username = mysqli_real_escape_string($your_connection, $_POST['username']);

P.S.: Do not mix mysql_ functions* and mysqli_ functions*. Please use mysqli_* functions or PDO because mysql_* functions are deprecated and will be removed in the future.