こちらがコードなんですが、gmailで受信すると件名が文字化けします。どうすればよいでしょうか？

```

     <?php 
    
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = trim(filter_input(INPUT_POST,"name",FILTER_SANITIZE_STRING));
    $email = trim(filter_input(INPUT_POST,"email",FILTER_SANITIZE_EMAIL));
    $category = trim(filter_input(INPUT_POST,"category",FILTER_SANITIZE_STRING));
    $title = trim(filter_input(INPUT_POST,"title",FILTER_SANITIZE_STRING));
    $format = trim(filter_input(INPUT_POST,"format",FILTER_SANITIZE_STRING));
    $genre = trim(filter_input(INPUT_POST,"genre",FILTER_SANITIZE_STRING));
    $year = trim(filter_input(INPUT_POST,"year",FILTER_SANITIZE_STRING));
    $details = trim(filter_input(INPUT_POST,"details",FILTER_SANITIZE_SPECIAL_CHARS));
    
    if ($name == "" || $email == "" || $category == "" || $title == "") {
        $error_message = "Please fill in the required fields: Name, Email, Category and Title";
    }
    if (!isset($error_message) && $_POST["address"] != "") {
        $error_message = "Bad form input";
    }
    
    require("inc/phpmailer/class.phpmailer.php");
    
    $mail = new PHPMailer;
    
    if (!isset($error_message) && !$mail->ValidateAddress($email)) {
        $error_message = "Invalid Email Address";
    }
    
    if (!isset($error_message)) {
        $email_body = "";
        $email_body .= "Name " . $name . "\n";
        $email_body .= "Email " . $email . "\n";
        $email_body .= "Suggested Item\n";
        $email_body .= "Category " . $category . "\n";
        $email_body .= "Title " . $title . "\n";
        $email_body .= "Format " . $format . "\n";
        $email_body .= "Genre " . $genre . "\n";
        $email_body .= "Year " . $year . "\n";
        $email_body .= "Details " . $details . "\n";
    
        $mail->setFrom($email, $name);
        $mail->addAddress('treehouse@localhost', 'Alena');     // Add a recipient
    
        $mail->isHTML(false);                                  // Set email format to HTML
    
        $mail->Subject = 'Personal Media Library Suggestion from ' . $name;
        $mail->Body    = $email_body;
    
        if($mail->send()) {
            header("location:suggest.php?status=thanks");
            exit;
        }
        $error_message = 'Message could not be sent.';
        $error_message .= 'Mailer Error: ' . $mail->ErrorInfo;
    }
    
    }
    
    $pageTitle = "Suggest a Media Item";
    $section = "suggest";
    
    include("inc/header.php"); 
    ?>
    
    <div class="section page">
     <div class="wrapper">
        <h1>Suggest a Media Item</h1>
        <?php if (isset($_GET["status"]) && $_GET["status"] == "thanks") {
            echo "<p>Thanks for the email! I&rsquo;ll check out your suggestion shortly!</p>";
        } else {
            if (isset($error_message)) {
                echo "<p class='message'>".$error_message . "</p>";
            } else {
                echo "<p>If you think there is something I&rsquo;m missing, let me know! Complete the form to send me an email.</p>";
            }
        ?>
        <form method="post" action="suggest.php">
            <table>
            <tr>
                <th><label for="name">Name (required)</label></th>
                <td><input type="text" id="name" name="name" /></td>
            </tr>
            <tr>
                <th><label for="email">Email (required)</label></th>
                <td><input type="text" id="email" name="email" /></td>
            </tr>
            <tr>
                <th><label for="category">Category (required)</label></th>
                <td><select id="category" name="category">
                    <option value="">Select One</option>
                    <option value="Books">Book</option>
                    <option value="Movies">Movie</option>
                    <option value="Music">Music</option>
                </select></td>
            </tr>
            <tr>
                <th><label for="title">Title (required)</label></th>
                <td><input type="text" id="title" name="title" /></td>
            </tr>
            <tr>
                <th><label for="format">Format</label></th>
                <td><select id="format" name="format">
                    <option value="">Select One</option>
                    <optgroup label="Books">
                        <option value="Audio">Audio</option>
                        <option value="Ebook">Ebook</option>
                        <option value="Hardback">Hardback</option>
                        <option value="Paperback">Paperback</option>
                    </optgroup>
                    <optgroup label="Movies">
                        <option value="Blu-ray">Blu-ray</option>
                        <option value="DVD">DVD</option>
                        <option value="Streaming">Streaming</option>
                        <option value="VHS">VHS</option>
                    </optgroup>
                    <optgroup label="Music">
                        <option value="Cassette">Cassette</option>
                        <option value="CD">CD</option>
                        <option value="MP3">MP3</option>
                        <option value="Vinyl">Vinyl</option>
                    </optgroup>
                </select></td>
            </tr>
            <tr>
                <th>
                    <label for="genre">Genre</label>
                </th>
                <td>
                    <select name="genre" id="genre">
                        <option value="">Select One</option>
                        <optgroup label="Books">
                            <option value="Action">Action</option>
                            <option value="Adventure">Adventure</option>
                            <option value="Comedy">Comedy</option>
                            <option value="Fantasy">Fantasy</option>
                            <option value="Historical">Historical</option>
                            <option value="Historical Fiction">Historical Fiction</option>
                            <option value="Horror">Horror</option>
                            <option value="Magical Realism">Magical Realism</option>
                            <option value="Mystery">Mystery</option>
                            <option value="Paranoid">Paranoid</option>
                            <option value="Philosophical">Philosophical</option>
                            <option value="Political">Political</option>
                            <option value="Romance">Romance</option>
                            <option value="Saga">Saga</option>
                            <option value="Satire">Satire</option>
                            <option value="Sci-Fi">Sci-Fi</option>
                            <option value="Tech">Tech</option>
                            <option value="Thriller">Thriller</option>
                            <option value="Urban">Urban</option>
                        </optgroup>
                        <optgroup label="Movies">
                            <option value="Action">Action</option>
                            <option value="Adventure">Adventure</option>
                            <option value="Animation">Animation</option>
                            <option value="Biography">Biography</option>
                            <option value="Comedy">Comedy</option>
                            <option value="Crime">Crime</option>
                            <option value="Documentary">Documentary</option>
                            <option value="Drama">Drama</option>
                            <option value="Family">Family</option>
                            <option value="Fantasy">Fantasy</option>
                            <option value="Film-Noir">Film-Noir</option>
                            <option value="History">History</option>
                            <option value="Horror">Horror</option>
                            <option value="Musical">Musical</option>
                            <option value="Mystery">Mystery</option>
                            <option value="Romance">Romance</option>
                            <option value="Sci-Fi">Sci-Fi</option>
                            <option value="Sport">Sport</option>
                            <option value="Thriller">Thriller</option>
                            <option value="War">War</option>
                            <option value="Western">Western</option>
                        </optgroup>
                        <optgroup label="Music">
                            <option value="Alternative">Alternative</option>
                            <option value="Blues">Blues</option>
                            <option value="Classical">Classical</option>
                            <option value="Country">Country</option>
                            <option value="Dance">Dance</option>
                            <option value="Easy Listening">Easy Listening</option>
                            <option value="Electronic">Electronic</option>
                            <option value="Folk">Folk</option>
                            <option value="Hip Hop/Rap">Hip Hop/Rap</option>
                            <option value="Inspirational/Gospel">Insirational/Gospel</option>
                            <option value="Jazz">Jazz</option>
                            <option value="Latin">Latin</option>
                            <option value="New Age">New Age</option>
                            <option value="Opera">Opera</option>
                            <option value="Pop">Pop</option>
                            <option value="R&B/Soul">R&amp;B/Soul</option>
                            <option value="Reggae">Reggae</option>
                            <option value="Rock">Rock</option>
                        </optgroup>
                    </select>
                </td>
            </tr>
            <tr>
                <th><label for="year">Year</label></th>
                <td><input type="text" id="year" name="year" /></td>
            </tr>
            <tr>
                <th><label for="name">Additional Details</label></th>
                <td><textarea name="details" id="details"></textarea></td>
            </tr>
            <tr style="display:none">
                <th><label for="address">Address</label></th>
                <td><input type="text" id="address" name="address" />
                <p>Please leave this field blank</p></td>
            </tr>
            </table>
            <input type="submit" value="Send" />
        </form>
        <?php } ?>
      </div>
    </div>
    
    <?php include("inc/footer.php"); ?>
    
```
CC BY-SA 3.0
2016-04-18T11:04:43.727
24117
2016-04-18T12:12:02.210
2016-04-18T11:16:08.370
10465
10465
question
php gmail
phpでメールフォームを作成し、gmailで受信すると件名が文字化けします。
$mail->CharSet = 'UTF-8';  
を加えたら直りました。
CC BY-SA 3.0
2016-04-18T12:12:02.210
24119
2016-04-18T12:12:02.210
10465
24117
answer