How to retrieve data from mysql in arabic and show it in PHP web page?

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PHP

MySQL

I have a problem in retrieving data from mysql table using php, it's appears as question marks but in the phpMyAdmin it's appears ok.

please see the following images:
Image 1
Image 2

What I have tried:

function getData() {
$result = $this->con->query("SELECT * FROM Comments");
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
echo "

" . $row["Guest"] . ": " . $row["Txt"] . "

";
}
} else {
echo "No Rows Found";
}
}

The charset in my php source as follows:
<meta charset="UTF-8" />