error logging (v6)

docs/installation/best-practices.md

@@ -15,7 +15,7 @@
 
 ExpressionEngine's system files and directories are typically safe from direct HTTP access on a properly configured server.
 
-However, for increased security we recommend that the `system` folder either be renamed or moved entirely above the public web root folder (commonly named public_html or referred to as simply "webroot") and that admin.php be renamed as well. This document describes the renaming process.
+However, for increased security we recommend that the `system` folder either be renamed or moved entirely above the public web root folder (commonly named `public_html` or referred to as simply "webroot") and that `admin.php` be renamed as well. This document describes the renaming process.
 
 ## Renaming the System Directory
 

docs/toc_sections/_best_practices_toc.yml

@@ -42,4 +42,6 @@
     - name: Simple Commerce Module
       href: troubleshooting/simple-commerce-module.md
     - name: Error Messages
-      href: troubleshooting/error-messages.md
+      href: troubleshooting/error-messages.md
+    - name: Error Logging
+      href: troubleshooting/error-logging.md

docs/troubleshooting/error-logging.md

@@ -0,0 +1,33 @@
+<!--
+    This source file is part of the open source project
+    ExpressionEngine User Guide (https://github.com/ExpressionEngine/ExpressionEngine-User-Guide)
+
+    @link      https://expressionengine.com/
+    @copyright Copyright (c) 2003-2020, Packet Tide, LLC (https://packettide.com)
+    @license   https://expressionengine.com/license Licensed under Apache License, Version 2.0
+-->
+
+# Error Logging
+
+[TOC]
+
+### Error Logging
+
+There could be situations when there is PHP error that is invisible to the user, but is preventing the code logic to be executed properly.
+
+To help finding those out, error logging could be enabled in ExpressionEngine.
+
+To enable error logging, you need to do the following:
+
+1. Create `logs` folder inside your `system/user` folder and make sure it's writable
+2. Open `config.php` file and add following config overrides
+    - [`log_threshold`](general/system-configuration-overrides.md#log_threshold) (required)
+    - [`log_date_format`](general/system-configuration-overrides.md#log_date_format) (optional)
+
+Example:
+```
+    $config['log_date_format'] = 'Y-m-d H:i:s';
+    $config['log_threshold'] = '1';
+```
+
+Now, when a code issue is encountered within ExpressionEngine, error or warning message is added to the file for corresponding date inside `system/user/logs` folder.