How to set right page encoding using PHP (UTF-8 HTTP header)?

Quite frequently, many are faced with the problem: incorrect definition of the browser page coding.
The easy way to fix it – set the right page encoding by PHP.
Example (we use the encoding utf-8) ↓

<?php
header('Content-Type: text/html; charset=utf-8');
/*....*/
?>

Additionally, you can specify the encoding using HTML
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