you should use this code
$yourConnection->set_charset("utf8");
for example
function insertUser($inUN,$inP,$inFN,$inLN,$inE,$inD)
{
$servername="localhost";
$username="mnr";
$password="milad1373";
$databacename="mnr01";
$conn = new mysqli($servername, $username, $password, $databacename);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$conn->set_charset("utf8");
$sql = "INSERT INTO chuser (username, passWord, fname,lname,email,date)
VALUES ('$inUN', '$inP','$inFN','$inLN', '$inE','$inD')";
if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
}
i had this problem but it resolved by this code
and for more information go to this link