开启php5.6的扩展php_sockets，出错，请问哪里找php_sockets.so

开启php5.6的扩展php_sockets,重启php5.6,提示出错了。

[20-Jun-2018 14:38:25] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library '/www/server/php/56/lib/php/extensions/no-debug-non-zts-20131226/php_sockets.dll' - /www/server/php/56/lib/php/extensions/no-debug-non-zts-20131226/php_sockets.dll: cannot open shared object file: No such file or directory in Unknown on line 0


请专家指导一下！

默认已开启此扩展的