Question

How would i do this using mysqli?

$SQL = mysql_query("SELECT username FROM users WHERE username = '$new_username'");
$result = mysql_num_rows($SQL);

If(!$result > 0) {
echo...

I tried:

$SQL = $mysqli->query("SELECT username FROM users WHERE username = '$utilizator");
$rezultat->num_rows($SQL);`

But I dont get any result.

Answer 1

You have started the query with $SQL .. continue with it as the object will be in that variable:

$SQL = $mysqli->query("SELECT username FROM users WHERE username = '$utilizator'");
$num = $SQL->num_rows();

if($num){
    // run your code here
}