unserialize() [function.unserialize]:偏移量 49151 处的错误,即 49151


unserialize() [function.unserialize]: Error at offset 49151 of 49151 bytes

在将对象存储到数据库中并检索它后,我像网站上的许多人一样出现偏移错误。如果我不存储它,一切正常:

$serializedObject = serialize($this);
$unSerializedObject = unserialize($serializedObject);

此外,我在保存数据并从数据库中检索数据时使用base64编码,但这无济于事。不过,我不做任何逃跑。我的对象处理一些字符串。我发现的是,有了这个字符串:

A woman is travelling around the world. She is 28 years old and she is from Great Britain.
She cannot use a car or a plane on her

它工作正常。但是当我再添加一个空格和单词 [ journey] 时,就会弹出错误。这是带有这个单词的字符串:

A woman is travelling around the world. She is 28 years old and she is from Great Britain.
She cannot use a car or a plane on her journey

我的问题是为什么会弹出错误?

这是针对文本运行的serialize($this)的输出,不带单词 journey

这是针对带有单词 journey 的文本运行的serialize($this)的输出

更新

我将对象保存到的表中具有字符集utf-8,并且由于它是 BLOB 类型,因此未定义字符集的列。mb_detect_encoding(serialize($this))返回UTF-8

$sql无法逃脱.这就是在我正在使用的 Kohana 框架中执行查询的方式:

$result = mysql_query($sql, $this->_connection)

原答案:

MySQL 中的 TEXT 字段最多存储 65535 个字节,所以我的猜测是它在那里被截断了。

请改用 MEDIUMTEXT 或 LONGTEXT。

除此之外,在将数据传入和传出数据库方面还存在潜在问题。PHP 序列化字符串可以包含空字节(字节 0),这似乎是未正确传输的内容。

解决此问题的一种方法是通过使用非常友好的字母数字/符号字母表的base64_encode()之类的东西对字符串进行编码。如果您将BLOB类型增加到 MEDIUMBLOBLONGBLOB,这将解决您的问题。

但是,如果您正确地将查询发送到数据库,则可以安全地发送原始字符串。由于您使用的是Kohana,因此这里有一个对我来说非常适合的示例。

简短版本:

$sql = 'INSERT INTO serialized_object (data) VALUES (:data)';
DB::query(Database::INSERT, $sql)->
  param(':data', $serialization)->
  execute();

法典:

<?php 
class Article {}
class Word {}
class Controller_Welcome extends Controller
{
    public function action_index()
    {
        $object = unserialize(hex2bin(file_get_contents('/tmp/data.hex')));
        $serialization = serialize($object);
        $sql = 'INSERT INTO serialized_object (data) VALUES (:data)';
        DB::query(Database::INSERT, $sql)->
            param(':data', $serialization)->
            execute();
        $saved_length = DB::query(Database::SELECT, '
            SELECT LENGTH(data) AS l
            FROM serialized_object
            ORDER BY id DESC
            LIMIT 1
        ')->execute()->get('l');
        if ($saved_length != strlen($serialization))
        {
            throw new Exception("Database length is incorrect. Value is corrupted in database.");
        }
        $saved_serialization = DB::query(Database::SELECT, '
            SELECT data
            FROM serialized_object
            ORDER BY id DESC
            LIMIT 1
        ')->execute()->get('data');
        $saved_object = unserialize($saved_serialization);
        if (!$saved_object)
        {
            throw new Exception("Unable to unserialize object.");
        }
        if ($saved_object != $object)
        {
            throw new Exception("Saved object is not equal to object.");
        }
        $this->response->body('Everything is fine.');
    }
} 

数据库.php:

<?php
return array
(
    'default' => array(
        'type'       => 'PDO',
        'connection' => array(
            /**
             * The following options are available for PDO:
             *
             * string   dsn         Data Source Name
             * string   username    database username
             * string   password    database password
             * boolean  persistent  use persistent connections?
             */
            'dsn'        => 'mysql:host=127.0.0.1;dbname=test',
            'username'   => 'root',
            'password'   => '****',
            'persistent' => FALSE,
        ),
        /**
         * The following extra options are available for PDO:
         *
         * string   identifier  set the escaping identifier
         */
        'table_prefix' => '',
        'charset'      => 'utf8',
        'caching'      => FALSE,
    ),
);

图式:

CREATE TABLE `serialized_object` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `data` longblob NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
使用

此方法解决了该问题:

$toDatabse = base64_encode(serialize($data));  // Save to database
$fromDatabase = unserialize(base64_decode($data)); //Getting Save Format 

但问题仍然存在,Baba函数findSerializeError发现错误的根本原因是什么?