Vedhæft fil i mail via. php

Hej eksperter!

Er der nogle, der ved, hvordan man kan vedhæfte en fil i en mail med  php? Skal man sætte en eller anden header i mail() eller?

Jeg fandt noget på nettet, men det virkede ikke rigtigt:
<?php
   
        $to = "masik7@gmail.com";
        $from = "someone@some.one";
        $subject = "Here is your attachment";
   
        $fileatt = "masik7_06-09-2007.pdf";
        $fileatttype = "application/pdf";
        $fileattname = "newname.pdf";
   
        $headers = "From: $from";
        $file = fopen( $fileatt, 'rb' );
        $data = fread( $file, filesize( $fileatt ) );
        fclose( $file );
        $semi_rand = md5( time() );
        $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";
   
        $headers .= "\nMIME-Version: 1.0\n" .
                    "Content-Type: multipart/mixed;\n" .
                    " boundary=\"{$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";
   
        $data = chunk_split( base64_encode( $data ) );
               
        $message .= "--{$mime_boundary}\n" .
                "Content-Type: {$fileatttype};\n" .
                " name=\"{$fileattname}\"\n" .
                "Content-Disposition: attachment;\n" .
                " filename=\"{$fileattname}\"\n" .
                "Content-Transfer-Encoding: base64\n\n" .
                $data . "\n\n" .
                "--{$mime_boundary}--\n";
        if( mail( $to, $subject, $message, $headers ) ) {
       
            echo "<p>The email was sent.</p>";
       
        }
        else {
       
            echo "<p>There was an error sending the mail.</p>";
       
        }
   
   
       
?>