unserialize()[function.unserialize]:49151字节的偏移49151处的错误

Question

在将对象存储到数据库之后,我在网站上有许多偏移错误,而不是检索它.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,但这没有用.我不做任何逃避.我的对象处理一些字符串.我发现的是这个字符串:

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.但是当我添加一个空格和单词[旅程]时,错误会弹出.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

我的问题是为什么弹出错误？

这是serialize($this)没有单词的文本运行的输出journey

以下是serialize($this)使用单词对文本运行的输出journey

UPDATE

我保存对象的表有charset utf-8和没有定义charset 的列,因为它是BLOB类型.该mb_detect_encoding(serialize($this))收益UTF-8

没有逃脱$sql.这是在我正在使用的Kohana框架内执行查询的方式:

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

Answer 1

原始答案:

MySQL中的TEXT字段最多可存储65535个字节,因此我的猜测是它被截断了.

请改用MEDIUMTEXT或LONGTEXT.

除此之外,如何将数据导入和导出数据库也存在潜在问题.PHP序列化字符串可以包含空字节(字节0),这似乎是没有正确传输的内容.

解决这个问题的一种方法是通过base64_encode()使用非常友好的字母数字/符号字母表来对字符串进行编码.如果您将BLOB类型增加到MEDIUMBLOB或,那将解决您的问题LONGBLOB.

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.既然您正在使用Kohana,那么这个样本对我来说非常合适.

精简版:

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

码:

<?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.');
    }

} 

database.php中:

<?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,
    ),
);

架构:

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