Some environment variables are not working

[maxitromer]

Some environment variables work just fine, and some are not:

$ > cat /var/www/html/config/local.php 
<?php
$parameters = array(
        'db_driver' => 'pdo_mysql',
        'db_host' => getenv('MAUTIC_DB_HOST'),
        'db_port' => getenv('MAUTIC_DB_PORT'),
        'db_name' => getenv('MAUTIC_DB_DATABASE'),
        'db_user' => getenv('MAUTIC_DB_USER'),
        'db_password' => getenv('MAUTIC_DB_PASSWORD'),
        'db_table_prefix' => null,
        'db_backup_tables' => 1,
        'db_backupprefix' => 'bak',
);
$ >  printenv | grep PREFIX
MAUTIC_DB_TABLE_PREFIX=mt_