# composer install --no-dev --optimize-autoloader
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Installing dependencies from lock file
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - The requested PHP extension ext-mbstring * is missing from your system. Install or enable PHP's mbstring extension.
  Problem 2
    - The requested PHP extension ext-zip * is missing from your system. Install or enable PHP's zip extension.
  Problem 3
    - aws/aws-sdk-php 3.74.1 requires ext-simplexml * -> the requested PHP extension simplexml is missing from your system.
    - aws/aws-sdk-php 3.74.1 requires ext-simplexml * -> the requested PHP extension simplexml is missing from your system.
    - Installation request for aws/aws-sdk-php 3.74.1 -> satisfiable by aws/aws-sdk-php[3.74.1].

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.3/cli/php.ini
    - /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/20-calendar.ini
    - /etc/php/7.3/cli/conf.d/20-ctype.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-gettext.ini
    - /etc/php/7.3/cli/conf.d/20-iconv.ini
    - /etc/php/7.3/cli/conf.d/20-json.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-shmop.ini
    - /etc/php/7.3/cli/conf.d/20-sockets.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
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
[root@host /var/www/panel]#