Resumable PHP Upload (2)

<?php
    set_time_limit(0);
    header('Content-Type: text/html; charset=utf-8');

    $file_name        = 'D:\xampp\htdocs\_tests\resume\sql-dump.sql';
    $file_handle      = fopen($file_name, "a+");
    $php_input_handle = fopen("php://input", "r");

    while ( $data_chunk = fread($php_input_handle, 4096) )
    {
        $length_chunk = strlen($data_chunk);
        fwrite($file_handle, $data_chunk, $length_chunk );
    }

    fclose($file_handle);
    fclose($php_input_handle);
?>