Simple POST upload

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

    $file_name = base64_decode( strtr($_POST["file_name"], '-_,', '+/=') );
    if ( $file_name !== "" )
    {
        $temp_file_name = trim( $_FILES["upload_file"]['tmp_name'] );
        move_uploaded_file($temp_file_name, "/full/path/$file_name");

        echo "/full/path/$file_name";  // . $_FILES["upload_file"]['name'];
    }
?>