我目前正在使用Git和XAMPP for Linux（xampp-linux-x64-7.0.9-1）开发Api平台（Symfony 3.1，Doctrine 2.5）项目。我们鼓励每当有人更改实体时更新我们的数据库。但是，当我尝试这样做时，我收到了这条消息
ZWJ堆栈跟踪
$ bin/console doctrine:schema:update --force
PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[Symfony\Component\Debug\Exception\UndefinedFunctionException]
Attempted to call function "simplexml_load_file" from namespace "Doctrine\ORM\Mapping\Driver".
我发现了this问题，这表明可能没有安装simplexml。但是，当我运行phpinfo时显示它是
() at /opt/lampp/htdocs/api/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php:814
Doctrine\ORM\Mapping\Driver\XmlDriver->loadMappingFile() at /opt/lampp/htdocs/api/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/Driver/FileDriver.php:115
Doctrine\Common\Persistence\Mapping\Driver\FileDriver->getElement() at /opt/lampp/htdocs/api/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php:58
Doctrine\ORM\Mapping\Driver\XmlDriver->loadMetadataForClass() at /opt/lampp/htdocs/api/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/Driver/MappingDriverChain.php:102
Doctrine\Common\Persistence\Mapping\Driver\MappingDriverChain->loadMetadataForClass() at /opt/lampp/htdocs/api/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:151
Doctrine\ORM\Mapping\ClassMetadataFactory->doLoadMetadata() at /opt/lampp/htdocs/api/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:332
Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->loadMetadata() at /opt/lampp/htdocs/api/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:78
Doctrine\ORM\Mapping\ClassMetadataFactory->loadMetadata() at /opt/lampp/htdocs/api/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:216
Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getMetadataFor() at /opt/lampp/htdocs/api/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:115
Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getAllMetadata() at /opt/lampp/htdocs/api/vendor/doctrine/orm/lib/Doctrine/ORM/Tools/Console/Command/SchemaTool/AbstractCommand.php:59
Doctrine\ORM\Tools\Console\Command\SchemaTool\AbstractCommand->execute() at /opt/lampp/htdocs/api/vendor/doctrine/doctrine-bundle/Command/Proxy/UpdateSchemaDoctrineCommand.php:50
Doctrine\Bundle\DoctrineBundle\Command\Proxy\UpdateSchemaDoctrineCommand->execute() at /opt/lampp/htdocs/api/vendor/symfony/symfony/src/Symfony/Component/Console/Command/Command.php:261
Symfony\Component\Console\Command\Command->run() at /opt/lampp/htdocs/api/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:839
Symfony\Component\Console\Application->doRunCommand() at /opt/lampp/htdocs/api/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:185
Symfony\Component\Console\Application->doRun() at /opt/lampp/htdocs/api/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Console/Application.php:80
Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at /opt/lampp/htdocs/api/vendor/symfony/symfony/src/Symfony/Component/Console/Application.php:116
Symfony\Component\Console\Application->run() at /opt/lampp/htdocs/api/bin/console:29
由于问题似乎与Doctrine相关，我删除了vendor /文件夹并使用composer再次安装了所有这些。可悲的是，没有任何改变。作为最后一次尝试，我使用$ php -i | grep -i simplexml
SimpleXML
Simplexml support => enabled
选项运行更新，这给了我相同的结果。
有没有人遇到过这个问题？我认为它与Linux有关，因为团队的其他成员使用Windows并且从未遇到过这个问题。
编辑：正如评论中所建议的那样，我检查了php.ini中是否有＆＃34; extension = pdo.so＆＃34;线，它只出现一次。该部分文件是
--dump-sql如果我评论最后一行，则警告消失，但问题仍然存在。