PHP Code to E-Mail with Attachement

<?php
$to      = $_POST['to'];
$email   = $_POST['email'];
$name    = $_POST['name'];
$subject = $_POST['subject'];
$comment = $_POST['message'];
//Modifying data that come from POST
$To          = strip_tags($to);
$TextMessage =strip_tags(nl2br($comment),"<br>");
$HTMLMessage =nl2br($comment);
$FromName    =strip_tags($name);
$FromEmail   =strip_tags($email);
$Subject     =strip_tags($subject);
//Random Boundary Generator
$boundary1   =rand(0,9)."-"
.rand(10000000000,9999999999)."-"
.rand(10000000000,9999999999)."=:"
.rand(10000,99999);
$boundary2   =rand(0,9)."-".rand(10000000000,9999999999)."-"
.rand(10000000000,9999999999)."=:"
.rand(10000,99999);

//File Adder
for($i=0; $i < count($_FILES['youfile']['name']); $i++){
if(is_uploaded_file($_FILES['fileatt']['tmp_name'][$i]) &&
   !empty($_FILES['fileatt']['size'][$i]) &&
   !empty($_FILES['fileatt']['name'][$i])){
    
$attach      ='yes';
$end         ='';
//File Handler convert into base64 and make available to E-Mail
   $handle      =fopen($_FILES['fileatt']['tmp_name'][$i], 'rb');
   $f_contents  =fread($handle, $_FILES['fileatt']['size'][$i]);
   $attachment[]=chunk_split(base64_encode($f_contents));
   fclose($handle);
$ftype[]       =$_FILES['fileatt']['type'][$i];
$fname[]       =$_FILES['fileatt']['name'][$i];
}
}