final class Debug

1. 8.x drupal/core/vendor/symfony/debug/Symfony/Component/Debug/Debug.php \Symfony\Component\Debug\Debug
2. 8.x drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Util/Debug.php \Doctrine\Common\Util\Debug

DebugTest.php in drupal/core/vendor/doctrine/common/tests/Doctrine/Tests/Common/Util/DebugTest.php

CommentLinksTest::setEnvironment in drupal/core/modules/comment/lib/Drupal/comment/Tests/CommentLinksTest.php

Re-configures the environment, module settings, and user permissions.

ExceptionController::on500Html in drupal/core/lib/Drupal/Core/Controller/ExceptionController.php

Processes a generic exception into an HTTP 500 response.

hook_watchdog in drupal/core/modules/system/system.api.php

Log an event message.

Kernel::getContainerClass in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Kernel.php

Gets the container class.

SimpletestResultsForm::buildForm in drupal/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestResultsForm.php

Form constructor.

... See full list

final class Debug {

  /**
   * Private constructor (prevents from instantiation)
   *
   */
  private function __construct() {
  }

  /**
   * Prints a dump of the public, protected and private properties of $var.
   *
   * @link http://xdebug.org/
   * @param mixed $var
   * @param integer $maxDepth Maximum nesting level for object properties
   * @param boolean $stripTags Flag that indicate if output should strip HTML tags
   */
  public static function dump($var, $maxDepth = 2, $stripTags = true) {
    ini_set('html_errors', 'On');
    if (extension_loaded('xdebug')) {
      ini_set('xdebug.var_display_max_depth', $maxDepth);
    }
    $var = self::export($var, $maxDepth++);
    ob_start();
    var_dump($var);
    $dump = ob_get_contents();
    ob_end_clean();
    echo $stripTags ? strip_tags(html_entity_decode($dump)) : $dump;
    ini_set('html_errors', 'Off');
  }

  /**
   * Export
   *
   * @param mixed $var
   * @param int $maxDepth
   * @return mixed
   */
  public static function export($var, $maxDepth) {
    $return = null;
    $isObj = is_object($var);
    if ($isObj && in_array('Doctrine\\Common\\Collections\\Collection', class_implements($var))) {
      $var = $var
        ->toArray();
    }
    if ($maxDepth) {
      if (is_array($var)) {
        $return = array();
        foreach ($var as $k => $v) {
          $return[$k] = self::export($v, $maxDepth - 1);
        }
      }
      else {
        if ($isObj) {
          $return = new \stdclass();
          if ($var instanceof \DateTime) {
            $return->__CLASS__ = "DateTime";
            $return->date = $var
              ->format('c');
            $return->timezone = $var
              ->getTimeZone()
              ->getName();
          }
          else {
            $reflClass = ClassUtils::newReflectionObject($var);
            $return->__CLASS__ = ClassUtils::getClass($var);
            if ($var instanceof \Doctrine\Common\Persistence\Proxy) {
              $return->__IS_PROXY__ = true;
              $return->__PROXY_INITIALIZED__ = $var
                ->__isInitialized();
            }
            foreach ($reflClass
              ->getProperties() as $reflProperty) {
              $name = $reflProperty
                ->getName();
              $reflProperty
                ->setAccessible(true);
              $return->{$name} = self::export($reflProperty
                ->getValue($var), $maxDepth - 1);
            }
          }
        }
        else {
          $return = $var;
        }
      }
    }
    else {
      $return = is_object($var) ? get_class($var) : (is_array($var) ? 'Array(' . count($var) . ')' : $var);
    }
    return $return;
  }

  /**
   * Convert to string
   *
   * @param object $obj
   * @return string
   */
  public static function toString($obj) {
    return method_exists('__toString', $obj) ? (string) $obj : get_class($obj) . '@' . spl_object_hash($obj);
  }

}