PHPStan: introduce static analysis

Author: Slamdunk

composer.json

@@ -14,11 +14,15 @@
         "php": "^7.1"
     },
     "require-dev": {
+        "phpstan/phpstan": "^0.9.1",
+        "phpstan/phpstan-phpunit": "^0.9.3",
         "phpunit/phpunit": "^6.5",
         "roave/security-advisories": "dev-master",
         "slam/php-cs-fixer-extensions": "^1.12",
         "slam/php-debug-r": "^1.2",
-        "symfony/console": "^4.0"
+        "slam/phpstan-extensions": "^1.0",
+        "symfony/console": "^4.0",
+        "thecodingmachine/phpstan-strict-rules": "^0.9.0"
     },
     "autoload": {
         "psr-4": {

phpstan.neon

@@ -0,0 +1,11 @@
+includes:
+    - vendor/phpstan/phpstan/conf/config.levelmax.neon
+    - vendor/phpstan/phpstan-phpunit/extension.neon
+    - vendor/slam/phpstan-extensions/conf/slam-rules.neon
+    - vendor/slam/phpstan-extensions/conf/thecodingmachine-rules.neon
+
+parameters:
+    ignoreErrors:
+        - '#Class Doctrine\\Common\\Util\\Debug not found#'
+        - '#Call to static method export\(\) on an unknown class Doctrine\\Common\\Util\\Debug#'
+        - '#Constant ROOT_PATH not found#'

tests/ErrorHandlerTest.php

@@ -13,6 +13,9 @@ final class ErrorHandlerTest extends TestCase
 {
     private $backupErrorLog;
     private $errorLog;
+    private $exception;
+    private $emailsSent;
+    private $errorHandler;
 
     protected function setUp()
     {
@@ -104,7 +107,7 @@ public function testScream()
 
         $warningMessage = \uniqid('warning_');
         $this->expectException(ErrorException::class);
-        $this->expectExceptionMessageRegexp(\sprintf('/%s/', \preg_quote($warningMessage)));
+        $this->expectExceptionMessageRegExp(\sprintf('/%s/', \preg_quote($warningMessage)));
 
         @ \trigger_error($warningMessage, \E_USER_WARNING);
     }