add phan

.phan/config.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * This configuration will be read and overlaid on top of the
+ * default configuration. Command line arguments will be applied
+ * after this file is read.
+ */
+return [
+    // Supported values: '7.0', '7.1', '7.2', null.
+    // If this is set to null,
+    // then Phan assumes the PHP version which is closest to the minor version
+    // of the php executable used to execute phan.
+    'target_php_version' => null,
+
+    // A list of directories that should be parsed for class and
+    // method information. After excluding the directories
+    // defined in exclude_analysis_directory_list, the remaining
+    // files will be statically analyzed for errors.
+    //
+    // Thus, both first-party and third-party code being used by
+    // your application should be included in this list.
+    'directory_list' => [
+        'MO4',
+        'tests',
+    ],
+
+    // A directory list that defines files that will be excluded
+    // from static analysis, but whose class and method
+    // information should be included.
+    //
+    // Generally, you'll want to include the directories for
+    // third-party code (such as "vendor/") in this list.
+    //
+    // n.b.: If you'd like to parse but not analyze 3rd
+    //       party code, directories containing that code
+    //       should be added to both the `directory_list`
+    //       and `exclude_analysis_directory_list` arrays.
+    "exclude_analysis_directory_list" => [
+        'vendor/'
+    ],
+];

.travis.yml

@@ -18,6 +18,9 @@ script:
       composer require phpstan/phpstan --dev
       composer require phpstan/phpstan-strict-rules --dev
       vendor/bin/phpstan analyse --level=max --no-progress -c .phpstan.neon MO4 tests
+      pecl install -f ast-0.1.6
+      composer require phan/phan --dev
+      vendor/bin/phan -i
     fi
   - php -d zend_extension=xdebug.so vendor/bin/phpunit --coverage-clover=coverage.xml