如果在执行PHP相关命令时，看到一条警告消息：
PHP Warning: Module ‘curl‘ already loaded in Unknown on line 0
那是由于curl模块已经被PHP标准库内建了，如果在/etc/php/8.2/fpm/php.ini和/etc/php/8.2/fpm/conf.d/20-curl.ini两处配置文件里又启用了curl扩展，就会报这个警告。
解决方法是在这两个配置文件中都不启用curl扩展，就是使用;号注释掉extension=curl.so这行。修改了配置文件记得重启php-fpm服务，最后只要在php -m命令的输出中看到curl了，就说明已启用curl扩展。
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