Send file by mail

<?php
if( isset( $_POST['submit_apply'] ) ) {
    global $post, $userdata;

    //echo '<pre>'; print_r( $_POST ); echo '</pre>';
    //echo '<pre>'; print_r( $_FILES ); echo '</pre>';

    $error = false;
    $attachments = array();
    $to = array();
    $uploads = wp_upload_dir();
    $uploads_dir = $uploads['path'];
    $mime = array(
        'application/pdf', 'application/msword',
        'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
    );

    if( count( $_FILES ) ) {
        foreach( $_FILES as $file ) {
            if( $file ) {

                if( !in_array( $file['type'], $mime ) ) {
                    $error = true;
                    break;
                }

                //echo '<pre>'; print_r( $file ); echo '</pre>';
                //upload the files temporary and save the path in array

                $path = $uploads_dir . '/' . $file['name'];
                if( move_uploaded_file( $file['tmp_name'], $path ) ) {
                    $attachments[] = $path;
                }
            }
        }

        //exit;
    }

    if( $error == false ) {

        if( $to_author = get_post_meta( $post->ID, 'job-email', true ) ) {
            $to[] = $to_author;
        }

        if( $_POST['send_copy'] == 'yes' ) {
            $to[] = $userdata->user_email;
        }

        $message = 'Iemand heeft zojuist gesolliciteerd op uw vacature:
        "%s"

        In de bijlage van deze e-mail staan de documenten van de kandidaat. U kunt deze vacature op elk ogenblik sluiten of verwijderen door naar uw dashboard te gaan.

        De vacature zelf kunt hier bekijken: "%s"
        ';

        $message = sprintf( $message, $post->post_title, get_permalink( $post->ID ) );

        $redir_url = '';
        if( $attachments ) {
            wp_mail( $to, 'Nieuwe sollicitant op Freelance.sr', $message, '', $attachments);
            $redir_url = add_query_arg( array( 'msg' => 'yes' ) );

            //update the applicant list
            $applicants = get_post_meta( $post->ID, 'applicants', true );
            if( $applicants == '' ) {
                $user_list = "{$userdata->ID}";
            } else {
                $user_list = $applicants . ",{$userdata->ID}";
            }

            update_post_meta( $post->ID, 'applicants', $user_list);
        }

        //echo '<pre>'; print_r( $to ); echo '</pre>';
        //echo '<pre>'; print_r( $attachments ); echo '</pre>';

        //now delete the uploaded files
        foreach( $attachments as $file ) {
            if( file_exists( $file ) ) {
                unlink( $file );
            }
        }

        if( $redir_url ) {
            wp_redirect( $redir_url );
        }
    }
}