環境:

[root@localhost php.d]# cat /etc/redhat-release CentOS Linux release 7.4.1708 (Core) [root@localhost php.d]# php -v PHP 7.2.10 (cli) (built: Sep 15 2018 07:10:58) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologieswith Xdebug v2.6.0, Copyright (c) 2002-2018, by Derick Rethans

為php安裝event擴展，搜索下：yum search php | grep event

[root@localhost php.d]# yum search php | grep event php-evenement.noarch : événement is a very simple event dispatching library for php-ezc-EventLog.noarch : Allows you to log events or audit trails php-kdyby-events.noarch : Events for Nette Framework php-pecl-event.x86_64 : Provides interface to libevent library php-react-event-loop.noarch : Event loop abstraction layer that libraries can: use for evented I/O php-react-http.noarch : Library for building an evented http server php-sabre-event.noarch : Lightweight library for event-based programming php-symfony-event-dispatcher.noarch : Symfony EventDispatcher Component

感覺沒有合適的包，改用: pecl search event搜索, 找到了event和libevent包，我選擇安裝event

安裝: pecl install event

安裝完成后，將"extension=event.so"加入php.ini文件，但是遇到了標題中描述的錯誤，如下：

[root@localhost php.d]# php -m PHP Warning: PHP Startup: Unable to load dynamic library 'event.so' (tried: /usr/lib64/php/modules/event.so (/usr/lib64/php/modules/event.so: undefined symbol: php_sockets_le_socket), /usr/lib64/php/modules/event.so.so (/usr/lib64/php/modules/event.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 [PHP Modules]

修改：sockets.ini, 如下：

[root@localhost php.d]# cat sockets.ini ; Enable sockets extension module extension=sockets.so extension=event.so

問題解決，似乎是加載順序導致的！因為event.so依賴于sockets.so！

總結

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