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`pchanger.php`

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<?php
include('check_login.php');

$file_in = "users.json";
$json = json_decode(file_get_contents($file_in), true);

if($_SESSION["password"] == $_POST["npassword"]){
    header("location:pmanager.php?mess=OLD");
    exit();
}

if($_POST["opassword"] != $_SESSION["password"]){
    header("location:pmanager.php?mess=BAD");
    exit();
}


foreach($json["users"] as &$u){
    if($u["usn"]==$_SESSION["username"]){
        $u["pwd"]=$_POST["npassword"];
        $file_out = "users.json";
        $file = fopen($file_out, "w");
        fwrite($file, json_encode($json, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
        fclose($file);
    }
}

header("location:index.php?mess=NEWPASS");
exit();
?>