php-fpm模式
在页面中打印phpinfo(),通过浏览器访问，在页面中搜索php.ini
找到Configuration File (php.ini) Path 这一项即可
cli模式
方法1：通过php -i(PHP information) 在php信息中搜索php.ini。（这里同php-fpm模式中的phpinfo()）
$ php -i|grep php.iniConfiguration File (php.ini) Path => /etc/php/7.3/cliLoaded Configuration File => /etc/php/7.3/cli/php.ini方法2：通过php --ini( Show configuration file names),显示所有配置文件名称
$ php --iniConfiguration File (php.ini) Path: /etc/php/7.3/cliLoaded Configuration File: ????????/etc/php/7.3/cli/php.iniScan for additional .ini files in: /etc/php/7.3/cli/conf.dAdditional .ini files parsed: ?????/etc/php/7.3/cli/conf.d/10-mysqlnd.ini,/etc/php/7.3/cli/conf.d/10-opcache.ini,/etc/php/7.3/cli/conf.d/10-pdo.ini,/etc/php/7.3/cli/conf.d/15-xml.ini,/etc/php/7.3/cli/conf.d/20-amqp.ini,/etc/php/7.3/cli/conf.d/20-apcu.ini,/etc/php/7.3/cli/conf.d/20-calendar.ini,/etc/php/7.3/cli/conf.d/20-ctype.ini,/etc/php/7.3/cli/conf.d/20-curl.ini,/etc/php/7.3/cli/conf.d/20-dom.ini,/etc/php/7.3/cli/conf.d/20-exif.ini,/etc/php/7.3/cli/conf.d/20-fileinfo.ini,/etc/php/7.3/cli/conf.d/20-ftp.ini,/etc/php/7.3/cli/conf.d/20-gearman.ini,/etc/php/7.3/cli/conf.d/20-gettext.ini,/etc/php/7.3/cli/conf.d/20-iconv.ini,/etc/php/7.3/cli/conf.d/20-igbinary.ini,/etc/php/7.3/cli/conf.d/20-imagick.ini,/etc/php/7.3/cli/conf.d/20-json.ini,/etc/php/7.3/cli/conf.d/20-mbstring.ini,/etc/php/7.3/cli/conf.d/20-mongodb.ini,/etc/php/7.3/cli/conf.d/20-msgpack.ini,/etc/php/7.3/cli/conf.d/20-mysqli.ini,/etc/php/7.3/cli/conf.d/20-pdo_mysql.ini,/etc/php/7.3/cli/conf.d/20-phar.ini,/etc/php/7.3/cli/conf.d/20-posix.ini,/etc/php/7.3/cli/conf.d/20-readline.ini,/etc/php/7.3/cli/conf.d/20-redis.ini,/etc/php/7.3/cli/conf.d/20-shmop.ini,/etc/php/7.3/cli/conf.d/20-simplexml.ini,/etc/php/7.3/cli/conf.d/20-sockets.ini,/etc/php/7.3/cli/conf.d/20-ssh2.ini,/etc/php/7.3/cli/conf.d/20-stomp.ini,/etc/php/7.3/cli/conf.d/20-sysvmsg.ini,/etc/php/7.3/cli/conf.d/20-sysvsem.ini,/etc/php/7.3/cli/conf.d/20-sysvshm.ini,/etc/php/7.3/cli/conf.d/20-tokenizer.ini,/etc/php/7.3/cli/conf.d/20-wddx.ini,/etc/php/7.3/cli/conf.d/20-xdebug.ini,/etc/php/7.3/cli/conf.d/20-xmlreader.ini,/etc/php/7.3/cli/conf.d/20-xmlwriter.ini,/etc/php/7.3/cli/conf.d/20-xsl.ini,/etc/php/7.3/cli/conf.d/20-yaml.ini,/etc/php/7.3/cli/conf.d/25-apcu_bc.ini,/etc/php/7.3/cli/conf.d/25-memcached.ini快速定位PHP的配置文件php.ini
原文地址：http://blog.51cto.com/phpme/2329834