PMC-880 Make the necessary changes in the core according to the "Laravel" upgrade guide (From v5.5.42 to v5.6.0)

config/app.php

@@ -9,8 +9,6 @@ return [
     'url' => env('APP_URL', 'http://localhost'),
     'env' => env('APP_ENV', 'production'),
     'debug' => env('APP_DEBUG', false),
-    'log' => env('APP_LOG', 'single'),
-    'log_level' => env('APP_LOG_LEVEL', 'debug'),
     'cache_lifetime' => env('APP_CACHE_LIFETIME', 60),
     'timezone' => 'UTC',
     'providers' => [

config/logging.php

@@ -0,0 +1,85 @@
+<?php
+
+use Monolog\Handler\StreamHandler;
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Default Log Channel
+    |--------------------------------------------------------------------------
+    |
+    | This option defines the default log channel that gets used when writing
+    | messages to the logs. The name specified in this option should match
+    | one of the channels defined in the "channels" configuration array.
+    |
+    */
+
+    'default' => env('APP_LOG', env('LOG_CHANNEL', 'daily')),
+
+    /*
+    |--------------------------------------------------------------------------
+    | Log Channels
+    |--------------------------------------------------------------------------
+    |
+    | Here you may configure the log channels for your application. Out of
+    | the box, Laravel uses the Monolog PHP logging library. This gives
+    | you a variety of powerful log handlers / formatters to utilize.
+    |
+    | Available Drivers: "single", "daily", "slack", "syslog",
+    |                    "errorlog", "monolog",
+    |                    "custom", "stack"
+    |
+    */
+
+    'channels' => [
+        'stack' => [
+            'driver' => 'stack',
+            'channels' => ['single'],
+        ],
+
+        'single' => [
+            'driver' => 'single',
+            'path' => storage_path('logs/processmaker.log'),
+            'level' => 'debug',
+        ],
+
+        'daily' => [
+            'driver' => 'daily',
+            'tap' => [
+                App\Logging\CustomizeFormatter::class
+            ],
+            'path' => storage_path('logs/processmaker.log'),
+            'level' => env('APP_LOG_LEVEL', 'debug'),
+            'days' => $app->make('config')->get('app.log_max_files', 5),
+        ],
+
+        'slack' => [
+            'driver' => 'slack',
+            'url' => env('LOG_SLACK_WEBHOOK_URL'),
+            'username' => 'Laravel Log',
+            'emoji' => ':boom:',
+            'level' => 'critical',
+        ],
+
+        'stderr' => [
+            'driver' => 'monolog',
+            'handler' => StreamHandler::class,
+            'with' => [
+                'stream' => 'php://stderr',
+            ],
+        ],
+
+        'syslog' => [
+            'driver' => 'syslog',
+            'level' => 'debug',
+        ],
+
+        'errorlog' => [
+            'driver' => 'errorlog',
+            'level' => 'debug',
+        ],
+
+    ],
+
+];