文件附件无法使用此提及的代码。这有什么解决方案吗？附加文件的代码中有什么错误？我需要附加所有类型的extn文件。
<?php
$c_name=$_POST['c_name'];
$title=$_POST['title'];
$comp_name=$_POST['comp_name'];
$add_1=$_POST['add_1'];
$add_2=$_POST['add_2'];
$city=$_POST['city'];
$state_name=$_POST['state_name'];
$zip=$_POST['zip'];
$phone=$_POST['phone'];
$fax=$_POST['fax'];
$email=$_POST['email'];
$message=$_POST['message'];
$hear=$_POST['hear'];
$upload_file=$_POST['upload_file'];
$body .= "Contact Name: " . $c_name . "\n";
$body .= "Title: " . $title . "\n";
$body .= "Company Name: " . $comp_name . "\n";
$body .= "Address 1: " . $add_1 . "\n";
$body .= "Address 2: " . $add_2 . "\n";
$body .= "City: " . $city . "\n";
$body .= "State/Province: " . $state_name . "\n";
$body .= "Zip Code: " . $zip . "\n";
$body .= "Phone: " . $phone . "\n";
$body .= "Fax: " . $fax . "\n";
$body .= "E-mail: " . $email . "\n";
$body .= "Message: " . $message . "\n";
$body .= "Hear about us from:" . $hear . "\n";
$file .= "". $upload_file . "\n";
//replace with your email
mail("example@example.com","New email",$body,$file);
?>