PHP 模块已加载警告

Question

刚刚注意到，当在 CLI 上执行时，PHP 会抛出警告：

php模块已经加载

$ php -v
PHP Warning:  Module 'PDO' already loaded in Unknown on line 0
PHP Warning:  Module 'calendar' already loaded in Unknown on line 0
PHP Warning:  Module 'ctype' already loaded in Unknown on line 0
PHP Warning:  Module 'exif' already loaded in Unknown on line 0
PHP Warning:  Module 'fileinfo' already loaded in Unknown on line 0
PHP Warning:  Module 'ftp' already loaded in Unknown on line 0
PHP Warning:  Module 'gettext' already loaded in Unknown on line 0
PHP Warning:  Module 'iconv' already loaded in Unknown on line 0
PHP Warning:  Module 'Phar' already loaded in Unknown on line 0
PHP Warning:  Module 'posix' already loaded in Unknown on line 0
PHP Warning:  Module 'shmop' already loaded in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20151012/sockets.so' - /usr/lib/php/20151012/sockets.so: undefined symbol: php_network_gethostbyname in Unknown on line 0
PHP Warning:  Module 'sysvmsg' already loaded in Unknown on line 0
PHP Warning:  Module 'sysvsem' already loaded in Unknown on line 0
PHP Warning:  Module 'sysvshm' already loaded in Unknown on line 0
PHP Warning:  Module 'tokenizer' already loaded in Unknown on line 0
PHP 7.0.3-5+deb.sury.org~trusty+1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with Xdebug v2.4.0RC4, Copyright (c) 2002-2016, by Derick Rethans

我知道，如何防止它们——只需从 /etc/php/7.0/cli/conf.d/{extname}.ini 文件中删除 extension={extname}.so 。但：

删除 INI 文件中的这一行是解决方案还是只是避免警告消息的解决方法？会因此产生任何副作用吗？为什么会发生/问题实际上是由什么引起的？

原文由 automatix 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

您可能已经在 php.ini 文件中加载了两次显示的扩展。

您可以搜索文件夹 /etc/php/7.0，您会在其中的子文件夹中找到 php.ini 文件，最有可能位于：

• /etc/php/7.0/cli/
• /etc/php/7.0/apache2/

如果您看到某些 extension=something.so 在这些 php.ini 文件中重复了两次，您可以将其从一个文件中删除，或者如果警告仍然显示从两个文件中删除。

原文由 Anurag Kumar 发布，翻译遵循 CC BY-SA 3.0 许可协议