zip圧縮

function zip($zipname, $file, $password) {
        $zip = new ZipArchive;
        $zip->open($zipname , ZipArchive::CREATE|ZipArchive::OVERWRITE);
        // パスワード設定
        $zip->setPassword($password);
        $zip->addFile($file);
        $zip->setEncryptionName($file, ZipArchive::EM_AES_256);
        $zip->close();
}

zip("a.zip", "sample.txt", "uoGhie6s");

メール送信

function sendMail( $to=null, $subject=null, $text=null, $file=null){

        //初期化
        $res = false;

        //日本語の使用宣言
        mb_language("ja");
        mb_internal_encoding("UTF-8");

        if( $to === null || $subject === null || $text === null ) {
                return false;
        }

        // 送信元の設定
        $sender_email = 'from@localhost';

        // ヘッダー設定
        $header = '';
        $header .= "From: ".$sender_email."\n";
        $header .= "Content-Type: multipart/mixed;boundary=\"__BOUNDARY__\"\n";

        // テキストメッセージを記述
        $body = "--__BOUNDARY__\n";
        $body .= "Content-Type: text/plain; charset=\"ISO-2022-JP\"\n\n";
        $body .= $text . "\n";
        $body .= "--__BOUNDARY__\n";

        // ファイルを添付
        $body .= "Content-Type: application/octet-stream; name=\"{$file}\"\n";
        $body .= "Content-Disposition: attachment; filename=\"{$file}\"\n";
        $body .= "Content-Transfer-Encoding: base64\n";
        $body .= "\n";
        $body .= chunk_split(base64_encode(file_get_contents($file)));
        $body .= "--__BOUNDARY__--";

        //メール送信
        $res = mb_send_mail( $to, $subject, $body, $header);

        return $res;
}

$result = sendMail("to@localhost", "subject", "bodyです", "a.zip");