diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..a7d94cc
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,15 @@
+{
+    "intelephense.diagnostics.undefinedVariables": false,
+    "intelephense.diagnostics.undefinedTypes": false,
+    "intelephense.diagnostics.undefinedSymbols": false,
+    "intelephense.diagnostics.undefinedProperties": false,
+    "intelephense.diagnostics.undefinedFunctions": false,
+    "intelephense.diagnostics.undefinedConstants": false,
+    "intelephense.diagnostics.undefinedClassConstants": false,
+    "intelephense.diagnostics.typeErrors": false,
+    "intelephense.diagnostics.embeddedLanguages": false,
+    "intelephense.diagnostics.duplicateSymbols": false,
+    "intelephense.diagnostics.deprecated": false,
+    "intelephense.diagnostics.argumentCount": false,
+    "intelephense.diagnostics.undefinedMethods": false
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 77925a0..ab4a9b5 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,6 @@ For example:
 
 ```xml
 <php>
-    <env name="wordPressPath" value="path/to/wordpress/wp-load.php"/>
+    <env name="wordPressPath" value="/path/to/wordpress/wp-load.php"/>
 </php>
 ````
diff --git a/composer.json b/composer.json
index 0894d60..7d276db 100644
--- a/composer.json
+++ b/composer.json
@@ -12,10 +12,17 @@
     },
     "autoload": {
         "psr-4": {
-            "Idearia\\WpTests": "src/"
+            "Idearia\\WpTests\\": "src/"
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^9.5",
+        "szepeviktor/phpstan-wordpress": "^1.1",
+        "phpstan/extension-installer": "^1.1"
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
     }
 }
diff --git a/composer.lock b/composer.lock
index 017af96..dd496b4 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d04a6a4216eec9684d7a430e94632a78",
+    "content-hash": "ccbaad56facaee32595a59eb166bedfa",
     "packages": [],
     "packages-dev": [
         {
@@ -303,6 +303,53 @@
             },
             "time": "2022-02-21T01:04:05+00:00"
         },
+        {
+            "name": "php-stubs/wordpress-stubs",
+            "version": "v5.9.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-stubs/wordpress-stubs.git",
+                "reference": "18d56875e5078a50b8ea4bc4b20b735ca61edeee"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-stubs/wordpress-stubs/zipball/18d56875e5078a50b8ea4bc4b20b735ca61edeee",
+                "reference": "18d56875e5078a50b8ea4bc4b20b735ca61edeee",
+                "shasum": ""
+            },
+            "replace": {
+                "giacocorsiglia/wordpress-stubs": "*"
+            },
+            "require-dev": {
+                "nikic/php-parser": "< 4.12.0",
+                "php": "~7.3 || ~8.0",
+                "php-stubs/generator": "^0.8.1",
+                "phpdocumentor/reflection-docblock": "^5.3",
+                "phpstan/phpstan": "^1.2"
+            },
+            "suggest": {
+                "paragonie/sodium_compat": "Pure PHP implementation of libsodium",
+                "symfony/polyfill-php73": "Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions",
+                "szepeviktor/phpstan-wordpress": "WordPress extensions for PHPStan"
+            },
+            "type": "library",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "WordPress function and class declaration stubs for static analysis.",
+            "homepage": "https://github.com/php-stubs/wordpress-stubs",
+            "keywords": [
+                "PHPStan",
+                "static analysis",
+                "wordpress"
+            ],
+            "support": {
+                "issues": "https://github.com/php-stubs/wordpress-stubs/issues",
+                "source": "https://github.com/php-stubs/wordpress-stubs/tree/v5.9.3"
+            },
+            "time": "2022-04-06T15:33:59+00:00"
+        },
         {
             "name": "phpdocumentor/reflection-common",
             "version": "2.2.0",
@@ -530,6 +577,110 @@
             },
             "time": "2021-12-08T12:19:24+00:00"
         },
+        {
+            "name": "phpstan/extension-installer",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/extension-installer.git",
+                "reference": "66c7adc9dfa38b6b5838a9fb728b68a7d8348051"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/extension-installer/zipball/66c7adc9dfa38b6b5838a9fb728b68a7d8348051",
+                "reference": "66c7adc9dfa38b6b5838a9fb728b68a7d8348051",
+                "shasum": ""
+            },
+            "require": {
+                "composer-plugin-api": "^1.1 || ^2.0",
+                "php": "^7.1 || ^8.0",
+                "phpstan/phpstan": ">=0.11.6"
+            },
+            "require-dev": {
+                "composer/composer": "^1.8",
+                "phing/phing": "^2.16.3",
+                "php-parallel-lint/php-parallel-lint": "^1.2.0",
+                "phpstan/phpstan-strict-rules": "^0.11 || ^0.12"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "class": "PHPStan\\ExtensionInstaller\\Plugin"
+            },
+            "autoload": {
+                "psr-4": {
+                    "PHPStan\\ExtensionInstaller\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Composer plugin for automatic installation of PHPStan extensions",
+            "support": {
+                "issues": "https://github.com/phpstan/extension-installer/issues",
+                "source": "https://github.com/phpstan/extension-installer/tree/1.1.0"
+            },
+            "time": "2020-12-13T13:06:13+00:00"
+        },
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.7.10",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "25e069474cf00215b0f64c60a26230908ef3eefa"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/25e069474cf00215b0f64c60a26230908ef3eefa",
+                "reference": "25e069474cf00215b0f64c60a26230908ef3eefa",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/1.7.10"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/phpstan",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-06-03T14:12:23+00:00"
+        },
         {
             "name": "phpunit/php-code-coverage",
             "version": "9.2.15",
@@ -1915,6 +2066,150 @@
             ],
             "time": "2020-09-28T06:39:44+00:00"
         },
+        {
+            "name": "symfony/polyfill-php73",
+            "version": "v1.26.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php73.git",
+                "reference": "e440d35fa0286f77fb45b79a03fedbeda9307e85"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/e440d35fa0286f77fb45b79a03fedbeda9307e85",
+                "reference": "e440d35fa0286f77fb45b79a03fedbeda9307e85",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.26-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php73\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php73/tree/v1.26.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-24T11:49:31+00:00"
+        },
+        {
+            "name": "szepeviktor/phpstan-wordpress",
+            "version": "v1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/szepeviktor/phpstan-wordpress.git",
+                "reference": "99cfea6b4c15af12dec09110b25dbc7521363f78"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/szepeviktor/phpstan-wordpress/zipball/99cfea6b4c15af12dec09110b25dbc7521363f78",
+                "reference": "99cfea6b4c15af12dec09110b25dbc7521363f78",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0",
+                "php-stubs/wordpress-stubs": "^4.7 || ^5.0",
+                "phpstan/phpstan": "^1.6",
+                "symfony/polyfill-php73": "^1.12.0"
+            },
+            "require-dev": {
+                "composer/composer": "^2.1.14",
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7",
+                "php-parallel-lint/php-parallel-lint": "^1.1",
+                "phpstan/phpstan-strict-rules": "^1.2",
+                "phpunit/phpunit": "^8 || ^9",
+                "szepeviktor/phpcs-psr-12-neutron-hybrid-ruleset": "^0.6"
+            },
+            "type": "phpstan-extension",
+            "extra": {
+                "phpstan": {
+                    "includes": [
+                        "extension.neon"
+                    ]
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "SzepeViktor\\PHPStan\\WordPress\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "WordPress extensions for PHPStan",
+            "keywords": [
+                "PHPStan",
+                "code analyse",
+                "code analysis",
+                "static analysis",
+                "wordpress"
+            ],
+            "support": {
+                "issues": "https://github.com/szepeviktor/phpstan-wordpress/issues",
+                "source": "https://github.com/szepeviktor/phpstan-wordpress/tree/v1.1.1"
+            },
+            "funding": [
+                {
+                    "url": "https://www.paypal.me/szepeviktor",
+                    "type": "custom"
+                }
+            ],
+            "time": "2022-05-11T18:41:40+00:00"
+        },
         {
             "name": "theseer/tokenizer",
             "version": "1.2.1",
diff --git a/examples/phpunit.example.xml b/examples/phpunit.example.xml
new file mode 100644
index 0000000..788b048
--- /dev/null
+++ b/examples/phpunit.example.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd" backupGlobals="false" backupStaticAttributes="false" bootstrap="vendor/autoload.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false">
+  <testsuites>
+    <testsuite name="Tests">
+      <directory suffix="Test.php">./tests/</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <env name="wordPressPath" value="../../../../../../"/>
+    <env name="blogId" value="20"/>
+  </php>
+</phpunit>
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..67529ab
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,5 @@
+# Make sure to use https://github.com/szepeviktor/phpstan-wordpress
+parameters:
+  level: 0
+  paths:
+    - src
diff --git a/src/WordPressTestCase.php b/src/WordPressTestCase.php
index 1d37dbf..cd14bfc 100644
--- a/src/WordPressTestCase.php
+++ b/src/WordPressTestCase.php
@@ -22,7 +22,7 @@ class WordPressTestCase extends \PHPUnit\Framework\TestCase
 	public static function setUpBeforeClass(): void
 	{
 		$wordPressPath = $_ENV['wordPressPath'] ?? '../../../../../../';
-		static::loadWordPress( $_ENV['wordPressPath'], (int)$_ENV['blogId'] );
+		static::loadWordPress( $wordPressPath, (int)$_ENV['blogId'] );
 	}
 
 	/**