How to decode the letter "yo"?

Question

PHP

There is a json file with text where there is a letter "ё" :
[{
"id": 25,
"pid": "0CjqYfx3NU1AghsPVoGFullXwl4umV",
"message": "Just yo is crazy!"
}]

Function to decode json to utf-8 :

function normJsonStr($str) {
    $pattern = "/\\\\u([a-f0-9]{4})/i";
    $callback = function ($m) {
          return chr(hexdec($m[1])-1072+224);
      };
      $str = preg_replace_callback($pattern, $callback, $str);
      return iconv('CP1251', 'UTF-8', $str);
  }

As a result, I get this:
[{
"id": 25,
"pid": "0CjqYfx3NU1AghsPVoGFullXwl4umV",
"message": "That's crazy!"
}]

I output everything in this way: It is
echo normJsonStr(json_encode($json));

necessary that e be like e :)

Answer 1

Why do we need all this perversion?

$data = ;
echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
/*
[
    {
        "id": 25,
        "pid": "0CjqYfx3NU1AghsPVoGFullXwl4umV",
        "message": "Одно лишь ё - это безумие!"
    }
]
*/