[11.x] Infers base path from composer instead (#49553)

* Uses composer instead of `debug_backtrace`

* Removes non used import

src/Illuminate/Foundation/Application.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Foundation;
 
 use Closure;
+use Composer\Autoload\ClassLoader;
 use Illuminate\Container\Container;
 use Illuminate\Contracts\Console\Kernel as ConsoleKernelContract;
 use Illuminate\Contracts\Foundation\Application as ApplicationContract;
@@ -226,8 +227,7 @@ public static function configure(string $baseDirectory = null)
     {
         $baseDirectory = match (true) {
             is_string($baseDirectory) => $baseDirectory,
-            isset($_ENV['APP_BASE_PATH']) => $_ENV['APP_BASE_PATH'],
-            default => dirname(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1)[0]['file'], 2),
+            default => static::inferBaseDirectory(),
         };
 
         return (new Configuration\ApplicationBuilder(new static($baseDirectory)))
@@ -236,6 +236,19 @@ public static function configure(string $baseDirectory = null)
             ->withCommands();
     }
 
+    /**
+     * Infer the application's base directory from the environment.
+     *
+     * @return string
+     */
+    public static function inferBaseDirectory()
+    {
+        return match (true) {
+            isset($_ENV['APP_BASE_PATH']) => $_ENV['APP_BASE_PATH'],
+            default => dirname(array_keys(ClassLoader::getRegisteredLoaders())[0]),
+        };
+    }
+
     /**
      * Get the version number of the application.
      *

tests/Foundation/FoundationApplicationBuilderTest.php

@@ -35,10 +35,10 @@ public function testBaseDirectoryWithEnv()
         $this->assertSame(__DIR__.'/as-env', $app->basePath());
     }
 
-    public function testBaseDirectoryWithDebugBacktrace()
+    public function testBaseDirectoryWithComposer()
     {
         $app = Application::configure()->create();
 
-        $this->assertSame(dirname(__DIR__), $app->basePath());
+        $this->assertSame(dirname(__DIR__, 2), $app->basePath());
     }
 }