$ php app/console fos:user:promote

$ php app/console fos:user:create
Please choose a username:admin
Please choose an email:admin21@dwq
Please choose a password:admin123
Created user admin

$ php app/console fos:user:promote
Please choose a username:admin
Please choose a role:ROLE_SUPER_ADMIN
PHP Warning:  Erroneous data format for unserializing 'Workshop\Bundle\BackendBundle\Entity\User' in E:\_My_File_____\_work\MyCode\myCode\phpworkspace
\symfony-workshop\vendor\doctrine\orm\lib\Doctrine\ORM\Mapping\ClassMetadataInfo.php on line
PHP Notice:  unserialize(): Error at offset  of  bytes in E:\_My_File_____\_work\MyCode\myCode\phpworkspace\symfony-workshop\ve
ndor\doctrine\orm\lib\Doctrine\ORM\Mapping\ClassMetadataInfo.php on line
PHP Fatal error:  Uncaught Error: __clone method called on non-object in E:\_My_File_____\_work\MyCode\myCode\phpworkspace\symfony-
workshop\vendor\doctrine\orm\lib\Doctrine\ORM\Mapping\ClassMetadataInfo.php:
Stack trace:
# E:\_My_File_____\_work\MyCode\myCode\phpworkspace\symfony-workshop\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php(): Do
ctrine\ORM\Mapping\ClassMetadataInfo->newInstance()
# E:\_My_File_____\_work\MyCode\myCode\phpworkspace\symfony-workshop\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php(): Do
ctrine\ORM\UnitOfWork->newInstance(Object(Doctrine\ORM\Mapping\ClassMetadata))
# E:\_My_File_____\_work\MyCode\myCode\phpworkspace\symfony-workshop\vendor\doctrine\orm\lib\Doctrine\ORM\Internal\Hydration\Simpl
eObjectHydrator.php(): Doctrine\ORM\UnitOfWork->createEntity('Workshop\\Bundle...', Array, Array)
# E:\_My_File_____\_work\MyCode\myCode\phpworkspace\symfony-workshop\vendor\doctrine\orm\lib\Doct in E:\_My_File_____\_work\MyCode
\myCode\phpworkspace\symfony-workshop\vendor\doctrine\orm\lib\Doctrine\ORM\Mapping\ClassMetadataInfo.php on line 

为什么会出现这个错误呢

原因就是你本机器上的php版本与你的doctrine Bundle版本有些问题；

找到你报错的行数

ve ndor\doctrine\orm\lib\Doctrine\ORM\Mapping\ClassMetadataInfo.php on line

那么如果你和我的代码一样是这段

    public function newInstance()
    {
        if ($this->_prototype === null) {
            if (PHP_VERSION_ID === 50429 || PHP_VERSION_ID === 50513) {
                $this->_prototype = $this->reflClass->newInstanceWithoutConstructor();
            } else {
                $this->_prototype = unserialize(sprintf('O:%d:"%s":0:{}', strlen($this->name), $this->name));
            }
        }

        return clone $this->_prototype;
    }

那么直接替换：

    public function newInstance()
    {
        // echo PHP_VERSION_ID; die();  // Uncomment this, in case you don't know your PHP_VERSION_ID
        if ($this->_prototype === null) {
            if (PHP_VERSION_ID === 50429 || PHP_VERSION_ID === 50609||PHP_VERSION_ID === 50629||PHP_VERSION_ID === 50513 || PHP_VERSION_ID === 50603 || PHP_VERSION_ID === 70009) { // This is the tricky line
                $this->_prototype = $this->reflClass->newInstanceWithoutConstructor();
            } else {
                $this->_prototype = unserialize(sprintf('O:%d:"%s":0:{}', strlen($this->name), $this->name));
            }
        }

        return clone $this->_prototype;
    }

其中PHP_VERSION_ID === 50429就是php版本号；

50429就是5.4.29,我的事5.6.29那么就是50629

如果有兴趣一起讨论php_Symfony的话还可以加群一起学习：

QQ群：182983780

参考以下是博客问题解决

http://stackoverflow.com/questions/24031048/fos-userbundle-unable-to-login

http://stackoverflow.com/questions/24596813/symfony2-contexterrorexception-on-production-server-erroneous-data-format-for

https://github.com/symfony/symfony/issues/11056