PHP将二进制文件存入数据库以及从数据库中读取二进制文件

<?php
$file = 'abcd.sqlite';

mysql_connect('localhost','root','123456');
mysql_select_db('zblog');
mysql_query('set names utf8');

/*
$backup_stream = file_get_contents($file);
// var_dump($backup_stream);exit;
// $PSize = filesize($file); 
// $backup_stream = addslashes(fread(fopen($file, "r"), $PSize)); 
// var_dump($backup_stream);exit;

$sql = 'insert into t_user(backup) values("'. addslashes($backup_stream) .'")';
mysql_query($sql) ;
echo mysql_error();


exit;
*/


$sql = 'select id,backup from t_user limit 1';
$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);

header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=db_backup.sqlite');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . strlen($row['backup']));
// ob_clean();
// flush();
// readfile($file);
echo $row['backup'];
exit;



/*
if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}
*/