<?php
 
return [
   ...
    'aliases' => [
        ...
        '@pliki'=>realpath(dirname(__FILE__).'/../../pliki')
    ],

Ścieżka do pliku

$path = Yii::getAlias('@pliki') . '/plik.pdf';

...
 
'components' => [
         ...
 
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ]
            ],
        ],
 
        ...
    ],

<?php
 
$config = [
    'components' => [
        'request' => [
            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
            'cookieValidationKey' => '23dYgoKbKertzSurkz6NwWgk2ntW9NII',
        ],
    ],
];
 
 
//if (!YII_ENV_TEST) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = [
        'class' => 'yii\debug\Module',
        'allowedIPs' => ['*'],
    ];
 
   $config['bootstrap'][] = 'gii';
   $config['modules']['gii'] = [
        'class' => 'yii\gii\Module',
    ];
//}
 
return $config;