How to write non English characters onto a webpage

I've been trying to write some non English characters on a web page, but I only see question marks after loading the page. Could anybody help me with doing this?

This is what I did.

<?php


$rr = 'Α,Β,Γ,Δ,Ε,Ζ,Η,Θ,Ι,Κ,Λ,Μ';
echo $rr


?>

and this is what the page displays

?,?,G,?,?,?,?,T,?,?,?,?

And trying this

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html" />
<title>Untitled 2</title>
</head>

<body>

    <p>Α,Β,Γ,Δ,Ε,Ζ,Η,Θ,Ι,Κ,Λ,Μ</p>

</body>
</html>

also shows the same output.

Solution

You need to specify the charset UTF-8.

You can do this via header() from PHP or via meta tag inside your HTML.

PHP: header('Content-Type: text/html;charset=utf-8');

HTML5: <meta charset="utf-8">

HTML4: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

test.html

<!DOCTYPE HTML>
<html>
  <head>
    <meta http-equiv="content-type" content="text/html;charset=utf-8" />
    <title>Untitled 2</title>
  </head>    
  <body>    
    <p>Α,Β,Γ,Δ,Ε,Ζ,Η,Θ,Ι,Κ,Λ,Μ</p>
  </body>
</html>

Ideone-DEMO: https://ideone.com/6vRqIc

As you can see in the DEMO i did not modify your PHP code. The Ideone website is served with UTF-8 charset, so it works out of the box.