Вопрос Ajax post request

[Moszczak]

trying to do gamesense notifications shit with js and php can somebody tell me what im doing wrong in php? js is copied from .pub
that's what i got

this is how it should look like

javascript (

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)
php

if (empty($_POST["csrf_token"])) {
    
} else {
    $username = $_POST["csrf_token"];
    $query = ("SELECT * FROM posts WHERE message LIKE '@$username'");
    $result = $db->query($query) or error('Unable to fetch user info', __FILE__, __LINE__, $db->error());
    while($row = $result->fetch_assoc()) {
        $id = $row["id"];
        $date = $row["posted"];
        echo json_encode(array("id" => $id, "date" => $date));
        exit;
    }
}