Email attachments from the command line

My hosting provider provides shell access and a crontab. I use that to email a database dump once a week. There's a PHP script to do that for me

        
<?php

    # send-att.php
    # Send a file from standard input to the given address.
    # 
    #
    # Example:
    # $ cat ~/.bashrc | gzip | \
    #      ./send-gz.php "Bash settings" \
    #      "bashrc.gz" "application/x-gzip" "jeroenpXredslider.net"

    $subject = $argv[1];
    $filename = $argv[2];
    $contenttype = $argv[3];
    $to = $argv[4];
    $time = time();
    $timestamp = strftime("%D %T", $time);
    $hostname = gethostbyaddr("127.0.0.1");
    $message = "(This attachment was generated $timestamp
using send-att.php on '$hostname'.)";
   
    $data = @file_get_contents("php://stdin") or die("Couldn't open stdin.");
    $attachment = chunk_split(base64_encode($data));
    $sep = md5(uniqid($time));

    $fields = array(
        "MIME-Version: 1.0", 
        "Content-Type: multipart/mixed; boundary=\"$sep\"", 
        "--$sep", 
        "Content-Type: text/plain; charset=ISO-8859-1",
        "",
        $message,
        "--$sep", 
        "Content-Type: $contenttype", 
        "Content-Transfer-Encoding: base64", 
        "Content-Disposition: attachment; filename=\"$filename\"", 
        "", 
        $attachment);
    
    mail($to, $subject, "", join($fields, "\r\n"));
    exit(0);
?>

  

In combination with the dump script below, a simple shell script does all the action:

$ php select-star.php | gzip | php send-att.php \
    "Bookreviews dump" \
    "bookreview.dmp.gz" \
    "application/x-gzip" \
    "Jeroen Pulles <user@domain.net>"