因php存在cli和php-fpm两种模式，因此两种运行模式会对应加载不同的配置文件。
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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.ini
Configuration File (php.ini) Path => /etc/php/7.3/cli
Loaded 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 --ini
Configuration File (php.ini) Path: /etc/php/7.3/cli
Loaded Configuration File: /etc/php/7.3/cli/php.ini
Scan for additional .ini files in: /etc/php/7.3/cli/conf.d
Additional .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-ssh3.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
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