graag verificatie van dit script

<?php

// append data to a log file
function _log($log_file,$ip,$email,$message)
{
$str = date('Y-m-d H:i:s') . " IP:$ip, EM:$email, $message\n";
file_put_contents($log_file,$str,FILE_APPEND);
}

$log_file = 'log.txt'; // log text file name

$ip = $_SERVER['REMOTE_ADDR']; // get ip to short variable name for logging purposes

$to = "[email protected]";
$subject= "inschrijving";
$name = $_POST['name'];
$phone = $_POST['phone'];
$email = $_POST['email'];
$website = $_POST['website'];
$beschrijving = $_POST['beschrijving'];
$socialURL = $_POST['socialURL'];
$cmname = $_POST['cmname'];
$faciliteit = $_POST['faciliteit'];
$add = $_POST['add'];
$city = $_POST['city'];
$zip = $_POST['zip'];
$keywords1 = $_POST['keywords1'];
$keywords2 = $_POST['keywords2'];
$keywords3 = $_POST['keywords3'];
$keywords4 = $_POST['keywords4'];
$keywords5 = $_POST['keywords5'];
$keywords6 = $_POST['keywords6'];
$prijslijst = $_POST['prijslijst'];
$openingsuren = $_POST['openingsuren'];
$klikbaar = $_POST['klikbaar'];
$socialFB = $_POST['socialFB'];
$socialTW = $_POST['socialTW'];
$socialIN = $_POST['socialIN'];
$socialGP = $_POST['socialGP'];
$opmerking = $_POST['opmerking'];
$message = "
Faciliteit: $faciliteit
Naam bedrijf: $cmname
Adres: $add, $zip $city

Beschrijving:
$beschrijving

Video:
$socialURL

Kernwoorden:
$keywords1
$keywords2
$keywords3
$keywords4
$keywords5
$keywords6

Prijslijst:
$prijslijst

Openklikbare tekst:
$klikbaar

Contactpersoon: $name
Telefoon: $phone
Email: $email
Website: $website

Openingsuren:
$openingsuren

Facebook: $socialFB
Instagram: $socialIN
Twitter: $socialTW
Google Plus: $socialGP

Verdere opmerkingen:
$opmerking
";
$mime_boundary="==Multipart_Boundary_x".md5(mt_rand())."x";
$headers = "From: $email\r\n" .
"MIME-Version: 1.0\r\n" .
"Content-Type: multipart/mixed;\r\n" .
" boundary=\"{$mime_boundary}\"";
$message = "This is a multi-part message in MIME format.\n\n" .
"--{$mime_boundary}\n" .
"Content-Type: text/plain; charset=\"iso-8859-1\"\n" .
"Content-Transfer-Encoding: 7bit\n\n" .
$message . "\n\n";
foreach($_FILES as $userfile)
{
$tmp_name = $userfile['tmp_name'];
$type = $userfile['type'];
$name = $userfile['name'];
$size = $userfile['size'];
if (file_exists($tmp_name))
{
if(is_uploaded_file($tmp_name))
{
$file = fopen($tmp_name,'rb');
$data = fread($file,filesize($tmp_name));
fclose($file);
$data = chunk_split(base64_encode($data));
}
$message .= "--{$mime_boundary}\n" .
"Content-Type: {$type};\n" .
" name=\"{$name}\"\n" .
"Content-Disposition: attachment;\n" .
" filename=\"{$fileatt_name}\"\n" .
"Content-Transfer-Encoding: base64\n\n" .
$data . "\n\n";
}
}
$message.="--{$mime_boundary}--\n";
if(mail($to, $subject, $message, $headers))
{
echo "Dankje om je gegevens door te zenden.<br>We nemen die door en contacteren je zo snel mogelijk.";
_log($log_file,$ip,$email,'Mail call successful.');

} else {
echo "Error in mail.<br>Probeer opnieuw door hieronder te klikken.";
$last_error = error_get_last();
_log($log_file,$ip,$email,"Mail call failed - {$last_error['message']}");

}
?>