Errors are written to the log file

composer.json

@@ -7,14 +7,15 @@
     "license": "MIT",
     "authors": [
         {
-            "name": "Finesse",
+            "name": "Surgie Finesse",
             "email": "[email protected]"
         }
     ],
     "require": {
         "php": ">=7.0",
         "slim/slim": "^3.1",
         "slim/php-view": "^2.0",
+        "psr/log": "^1.0",
         "monolog/monolog": "^1.17"
     },
     "require-dev": {

config/dependencies.php

@@ -10,6 +10,14 @@
 
 $container = $app->getContainer();
 
+// error handlers
+$container['phpErrorHandler'] = function (ContainerInterface $c) {
+    return new \Src\Handlers\PhpError($c->get('settings')['displayErrorDetails'], $c->get('logger'));
+};
+$container['errorHandler'] = function (ContainerInterface $c) {
+    return $c->get('phpErrorHandler');
+};
+
 // view renderer
 $container['renderer'] = function (ContainerInterface $c) {
     $settings = $c->get('settings')['renderer'];

src/Handlers/PhpError.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Src\Handlers;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Log\LoggerInterface;
+use Slim\Handlers\PhpError as BasePhpError;
+
+/**
+ * Class Error
+ *
+ * Custom error handler that writes error messages to logger.
+ *
+ * @author Finesse
+ * @package Src\Handlers
+ */
+class PhpError extends BasePhpError
+{
+    /**
+     * @var LoggerInterface Logger for writing error messages
+     */
+    protected $logger;
+
+    /**
+     * {@inheritDoc}
+     * @param LoggerInterface $logger A logger for writing error messages
+     */
+    public function __construct(bool $displayErrorDetails = false, LoggerInterface $logger)
+    {
+        parent::__construct($displayErrorDetails);
+        $this->logger = $logger;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, \Throwable $error)
+    {
+        // Log the message
+        $this->logger->error($error);
+        return parent::__invoke($request, $response, $error);
+    }
+}