PHP模块已加载警告

Question

刚刚注意到，在CLI上执行时，PHP会引发警告：

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extension={extname}.so从/etc/php/7.0/cli/conf.d/{extname}.ini文件中删除即可。但：

删除INI文件中的这一行是一种解决方案，还是一种避免警告消息的解决方法？会因此产生副作用吗？为什么会发生/实际是什么原因引起的？

Answer 1

Linux 上的 PHP 通常会扫描子文件夹以获取更多配置文件，这就是本例中发生的情况。

Configuration File (php.ini) Path => /etc/php/7.0/cli Loaded
Configuration File => /etc/php/7.0/cli/php.ini Scan this dir for additional .ini files => /etc/php/7.0/cli/conf.d 
Additional .ini files parsed => 
  /etc/php/7.0/cli/conf.d/10-opcache.ini,
  /etc/php/7.0/cli/conf.d/10-pdo.ini,
  /etc/php/7.0/cli/conf.d/20-calendar.ini,
  /etc/php/7.0/cli/conf.d/20-ctype.ini,
  /etc/php/7.0/cli/conf.d/20-curl.ini,
  /etc/php/7.0/cli/conf.d/20-exif.ini,
  /etc/php/7.0/cli/conf.d/20-fileinfo.ini,
  /etc/php/7.0/cli/conf.d/20-ftp.ini,
  /etc/php/7.0/cli/conf.d/20-gettext.ini,
  /etc/php/7.0/cli/conf.d/20-iconv.ini,
  /etc/php/7.0/cli/conf.d/20-json.ini,
  /etc/php/7.0/cli/conf.d/20-mcrypt.ini,
  /etc/php/7.0/cli/conf.d/20-mongodb.ini,
  /etc/php/7.0/cli/conf.d/20-mysqli.ini,
  /etc/php/7.0/cli/conf.d/20-pdo_mysql.ini,
  /etc/php/7.0/cli/conf.d/20-pdo_sqlite.ini,
  /etc/php/7.0/cli/conf.d/20-phar.ini,
  /etc/php/7.0/cli/conf.d/20-posix.ini,
  /etc/php/7.0/cli/conf.d/20-readline.ini,
  /etc/php/7.0/cli/conf.d/20-shmop.ini,
  /etc/php/7.0/cli/conf.d/20-sockets.ini,
  /etc/php/7.0/cli/conf.d/20-sqlite3.ini,
  /etc/php/7.0/cli/conf.d/20-sysvmsg.ini,
  /etc/php/7.0/cli/conf.d/20-sysvsem.ini,
  /etc/php/7.0/cli/conf.d/20-sysvshm.ini,
  /etc/php/7.0/cli/conf.d/20-tokenizer.ini,
  /etc/php/7.0/cli/conf.d/20-xdebug.ini,
  /etc/php/7.0/cli/conf.d/20-xsl.ini

稍微浏览一下 PHP 扫描该文件夹/etc/php/7.0/cli/，发现一个php.ini告诉它在名为 的子目录中应该有更多配置 (ini) 文件conf.d，并且每个模块都有自己的 ini 文件，通常在 Linux 和更高版本的 PHP 中。

回答“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？”的问题

conf.d老实说，我喜欢将每个模块的配置放在单独的文件中，但是如果您希望在文件中配置模块，则可以删除其中的文件php.ini。我只是发现它变得混乱。

Answer 2

您可能已经在php.ini文件中两次加载了显示的扩展名。

您可以搜索/etc/php/7.0文件夹，在该文件夹的子文件夹中可能找到php.ini文件：

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

如果您在这些php.ini文件中看到一些extension = something.so重复了两次，则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。