Почему форма не обрабатывает вложение?

Question

Elliot Alderson @Nordeezy

#fsoceity

PHP
HTML

Почему форма не обрабатывает вложение?

<?php

$method = $_SERVER['REQUEST_METHOD'];

//Script Foreach
$c = true;
if ( $method === 'POST' ) {

	$project_name = trim($_POST["project_name"]);
	$admin_email  = trim($_POST["admin_email"]);
	$form_subject = trim($_POST["form_subject"]);
    
 $headers .= "Content-Type: multipart/mixed; boundary=\"$boundary\"\r\n";
  $message="
Content-Type: multipart/mixed; boundary=\"$boundary\"
 
--$boundary
Content-Type: text/plain; charset=\"utf-8\"
Content-Transfer-Encoding: 7bit
 
$message";
     if(is_uploaded_file($_FILES['fileFF']['tmp_name'])) {
         $attachment = chunk_split(base64_encode(file_get_contents($_FILES['fileFF']['tmp_name'])));
         $filename = $_FILES['fileFF']['name'];
         $filetype = $_FILES['fileFF']['type'];
         $filesize = $_FILES['fileFF']['size'];
         $message.="
 
--$boundary
Content-Type: \"$filetype\"; name=\"$filename\"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=\"$filename\"
 
$attachment";
     }
   $message.="
--$boundary--";

	foreach ( $_POST as $key => $value ) {
		if ( $value != "" && $key != "project_name" && $key != "admin_email" && $key != "form_subject" ) {
			$message .= "
			" . ( ($c = !$c) ? '<tr>':'<tr style="background-color: #f8f8f8;">' ) . "
				<td style='padding: 10px; border: #e9e9e9 1px solid;'><b>$key</b></td>
				<td style='padding: 10px; border: #e9e9e9 1px solid;'>$value</td>
			</tr>
			";
		}
	}
} else if ( $method === 'GET' ) {

	$project_name = trim($_GET["project_name"]);
	$admin_email  = trim($_GET["admin_email"]);
	$form_subject = trim($_GET["form_subject"]);

	foreach ( $_GET as $key => $value ) {
		if ( $value != "" && $key != "project_name" && $key != "admin_email" && $key != "form_subject" ) {
			$message .= "
			" . ( ($c = !$c) ? '<tr>':'<tr style="background-color: #f8f8f8;">' ) . "
				<td style='padding: 10px; border: #e9e9e9 1px solid;'><b>$key</b></td>
				<td style='padding: 10px; border: #e9e9e9 1px solid;'>$value</td>
			</tr>
			";
		}
	}
}

$message = "<table style='width: 100%;'>$message</table>";

function adopt($text) {
	return '=?UTF-8?B?'.Base64_encode($text).'?=';
}

$headers = "MIME-Version: 1.0" . PHP_EOL .
"Content-Type: text/html; charset=utf-8" . PHP_EOL .
'From: '.adopt($project_name).' <'.$admin_email.'>' . PHP_EOL .
'Reply-To: '.$admin_email.'' . PHP_EOL;

mail($admin_email, adopt($form_subject), $message, $headers );

//E-mail Ajax Send 
$("form").submit(function() { //Change 
var th = $(this); 
$.ajax({ 
type: "POST", 
url: "mail.php", //Change 
data: th.serialize() 
}).done(function() { 
document.location.href = "thx.html"; 
setTimeout(function() { 
// Done Functions 
th.trigger("reset"); 
}, 1000); 
}); 
return false; 
}); 

});

<form id="ajax-contact-form" enctype="multipart/form-data" method="post">
        <div class="form">
        <h1 class="">Мы ждем Вашего запроса</h1>
        <div class="">
        <textarea class="" id="projectFF" name="projectFF"></textarea>
            <!-- Hidden Required Fields -->
		<input type="hidden" name="project_name" value="Site Name">
		<input type="hidden" name="admin_email" value="@.ru">
		<input type="hidden" name="form_subject" value="Form Subject">
		<!-- END Hidden Required Fields -->

		<input type="text" class="" name="Name" placeholder="Ваше имя" required><br>
		<input type="text"  class="" name="E-mail" placeholder="Ваш E-mail" required><br>
		<input type="text" class="" name="Phone" placeholder="Ваш телефон" required><br>

        </div>
            <div class="" >Прикрепить файл</div>
            <input id="fileFF" name="fileFF" type="file" multiple accept="image/*,image/jpeg,application/pdf,application/msword,text/plain,application/vnd.ms-excel"/>
            </div>

Почему форма не обрабатывает вложение?