PHP Warning mysqli_real_escape_string expects exactly 2 parameters

[Remix]

How to fix "PHP Warning:  mysqli_real_escape_string() expects exactly 2 parameters, 1 given in"

Wrong:

Code: [Select]

$Id = mysqli_real_escape_string($_GET['Id']);
Correct:

Code: [Select]

$Id = mysqli_real_escape_string($conn, $_GET['Id']);