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PHP

How do you create 3 email attachments in PHP (WITHOUT PHP MAILER)

I'm trying to create 3 email attachments. I'm just running this script on my local environment. However, its not working, and I continue to receive the error message:

'Not Found The requested URL /post was not found on this server.'

<?php

error_reporting(E_ALL);
ini_set('display_errors', 1);


if(isset($_FILES) && (bool) $_FILES) {
    $allowedExtensions = array("pdf","doc","docx","gif","jpeg","jpg","png","rtf","txt");

    $files = array();

    foreach($_FILES as $name=>$file) {
    $file_name = $file['name']; 
    $temp_name = $file['tmp_name'];
    $file_type = $file['type'];

    $path_parts = pathinfo($file_name);

    $ext = $path_parts['extension'];


    if(!in_array($ext,$allowedExtensions)) {

        die("File $file_name has the extensions $ext which is not allowed");
    }
        $server_file = "sw_uploaded_files_test/$path_parts[basename]";


        move_uploaded_file($temp_name,$server_file);

        array_push($files,$server_file);
    }

    $to = "kris@r4creative.uk";
    $from = "woodenchops@gmail.com"; 
    $subject ="test attachment"; 
    $message = "this is a test message";
    $headers = "From: $from";

    $semi_rand = md5(time()); 
    $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x"; 

    // headers for attachment 
    $headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$mime_boundary}\""; 

    // multipart 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"; 
    $message .= "--{$mime_boundary}\n";


    for($x=0;$x<count($files);$x++){
        $file = fopen($files[$x]['tmp_name'],"rb");
        $data = fread($file,filesize($files[$x]['tmp_name']));
        fclose($file);
        $data = chunk_split(base64_encode($data));
        $name = $files[$x]['name'];
        $message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$name\"\n" . 
        "Content-Disposition: attachment;\n" . " filename=\"$name\"\n" . 
        "Content-Transfer-Encoding: base64\n\n" . $data . "\n\n";
        $message .= "--{$mime_boundary}\n";
    }

    $ok = mail($to, $subject, $message, $headers); 
        if ($ok) { 
            echo "<p>mail sent to $to!</p>"; 
            } else { 
            echo "<p>mail could not be sent!</p>"; 
            } 

} // end of top level if statement 


?>








    <html lang="">

    <head>
        <style>
            input {
                margin: 1rem 0;
            }
        </style>
    </head>

    <body>
        <form action="post" action="index.php" enctype="multipart/form-data">
            <input type="file" name="attach_1"><br>
            <input type="file" name="attach_2"><br>
            <input type="file" name="attach_3"><br>
            <input type="submit" value="submit">
        </form>
    </body>

    </html>

To be fair, I have copied this code from a tutorial from YouTube, and trying to customise it for my own needs. So a lot of the code is alien to me.