Email HTML form submissions with csv file attachment - receiving multiple emails - php

Question

I've been asked to create a form that on submission sends the admin an email with a .csv attachment of the collated data.
I've scoured the internet and found this solution, and it works! However on submission I get about 3-4 emails (it seems to vary). Is this the code, or am I already receiving spam?
HTML Form:
<form method="post">
<p>Enter your email address
<input type="text" name="email" size="50" />
</p>
<p>Please add your first name
<input type="text" name="firstName" size="20" />
</p>
<p>Please add your last name
<input rows="2" name="lastName" size="20"></input>
</p>
<p> </p>
<p> </p>
<p>
<input type="submit" value="Submit" name="B1" />
<input type="reset" value="Reset" name="B2" />
</p>
</form>
PHP Code:
<?php
$email=$_REQUEST['email'];
$firstName=$_REQUEST['firstName'];
$lastName=$_REQUEST['lastName'];
$to = "test#testmail.co.uk";
$subject = "Test subject";
$message = "".
"Email: $email" . "\n" .
"First Name: $firstName" . "\n" .
"Last Name: $lastName";
//The Attachment
$cr = "\n";
$data = "Email" . ',' . "First Name" . ',' . "Last Name" . $cr;
$data .= "$email" . ',' . "$firstName" . ',' . "$lastName" . $cr;
$fp = fopen('diploma_apprenticeship_form_sub.csv','a');
fwrite($fp,$data);
fclose($fp);
$attachments[] = Array(
'data' => $data,
'name' => 'diploma_apprenticeship_form_sub.csv',
'type' => 'application/vnd.ms-excel'
);
//Generate a boundary string
$semi_rand = md5(time());
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";
//Add the headers for a file attachment
$headers = "MIME-Version: 1.0\n" .
"From: {$from}\n" .
"Content-Type: multipart/mixed;\n" .
" boundary=\"{$mime_boundary}\"";
//Add a multipart boundary above the plain message
$message = "This is a multi-part message in MIME format.\n\n" .
"--{$mime_boundary}\n" .
"Content-Type: text/html; charset=\"iso-8859-1\"\n" .
"Content-Transfer-Encoding: 7bit\n\n" .
$text . "\n\n";
//Add sttachments
foreach($attachments as $attachment){
$data = chunk_split(base64_encode($attachment['data']));
$name = $attachment['name'];
$type = $attachment['type'];
$message .= "--{$mime_boundary}\n" .
"Content-Type: {$type};\n" .
" name=\"{$name}\"\n" .
"Content-Transfer-Encoding: base64\n\n" .
$data . "\n\n" ;
}
$message .= "--{$mime_boundary}--\n";
mail($to, $subject, $message, $headers);
?>
Thanks in advance,
Matt

Answer 1

In the end I just added an if statement that says if the email field equals nothing don't send any emails. This stops the email being triggered when the page is loaded, and an email when the page resets after submission - hence why I was getting 3 emails!