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Alternative Stream_Copy_To_Stream () php

I am currently working on a file site and I am having a slight problem. I use downloadable download script, which works fine, but if the user wants the downloaded file to be encrypted. Now I have working code that does this, as shown below, but my server has only 1 GB or memory, and using stream_copy_to_stream seems to take the size of the actual file in memory, and my maximum upload size is 256, so I I know that something bad will happen when the site goes live, and several people upload large files at the same time. Based on my code below, is there an alternative that uses almost no memory, or nothing at all, I wouldn't even worry if it takes longer, I just need it to work. I have a version to download this work,because I have a file that was decrypted and immediately transferred to the browser, so it decrypts as it is downloaded, although I was quite effective, but this download problem does not look good. Any help is appreciated.

$temp_file = $_FILES['Filedata']['tmp_name'];
    $ext = pathinfo($_FILES['Filedata']['name'], PATHINFO_EXTENSION);
    $new_file_name = md5(uniqid(rand(), true));
    $target_file = rtrim(enc_target_path, '/') . '/' . $new_file_name . '.enc.' . $ext;

    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = substr(md5('some_salt' . $password, true) . md5($password . 'more_salt', true), 0, 24);
    $opts = array('iv' => $iv, 'key' => $key);

    $my_file = fopen($temp_file, 'rb');

    $encrypted_file_name = $target_file;
    $encrypted_file = fopen($encrypted_file_name, 'wb');

    stream_filter_append($encrypted_file, 'mcrypt.rijndael_128', STREAM_FILTER_WRITE, $opts);
    stream_copy_to_stream($my_file, $encrypted_file);

    fclose($encrypted_file);
    fclose($my_file);
    unlink($temp_file);

temp_file - ,

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1

, :

$my_file = fopen($temp_file, 'rb');

$encrypted_file_name = $target_file;
$encrypted_file = fopen($encrypted_file_name, 'wb');

stream_filter_append($encrypted_file, 'mcrypt.rijndael_128', STREAM_FILTER_WRITE, $opts);
//stream_copy_to_stream($my_file, $encrypted_file);

rewind($my_file);

while (!feof($my_file)) {
    fwrite($encrypted_file, fread($my_file, 4096));
}

stream_set_chunk_size stream_copy_to_stream, .

, .

EDIT: , 700 PHP 524,288 . , stream_copy_to_stream , , .

$encrypted_file_name = $target_file;
$encrypted_file = fopen($encrypted_file_name, 'wb');

stream_filter_append($encrypted_file, 'mcrypt.rijndael_128', STREAM_FILTER_WRITE, $opts);

$size = 16777216;  // buffer size of copy
$pos  = 0;         // initial file position

fseek($my_file, 0, SEEK_END);
$length = ftell($my_file);    // get file size

while ($pos < $length) {
    $writ = stream_copy_to_stream($my_file, $encrypted_file, $size, $pos);
    $pos += $writ;
}

fclose($encrypted_file);
fclose($my_file);
unlink($temp_file);
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