How to sanitize user input using PHP?

Receive input from users and user mysqli_real_eacape_string.

$name = mysqli_real_escape_string($_POST[‘name’]);
$pasword= mysqli_real_escape_string($_POST[‘password’]);

$query = “INSERT INTO Persons (Name, Password) VALUES (‘$name’, ‘$password’)”;

PHP 5.2 introduced the filter_var function

$email = “test@domain.com”;

if(filter_var($email, FILTER_VALIDATE_EMAIL))
{
echo(“$email is a valid email address”);
}
else
{
echo(“$email is not a valid email address”);
}