class Dumper

1. 8.x drupal/core/vendor/symfony/yaml/Symfony/Component/Yaml/Dumper.php \Symfony\Component\Yaml\Dumper
2. 8.x drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Dumper/Dumper.php \Symfony\Component\DependencyInjection\Dumper\Dumper

config.inc in drupal/core/includes/config.inc

This is the API for configuration storage.

DumperTest.php in drupal/core/vendor/symfony/yaml/Symfony/Component/Yaml/Tests/DumperTest.php

FileStorage.php in drupal/core/lib/Drupal/Core/Config/FileStorage.php

Definition of Drupal\Core\Config\FileStorage.

YamlDumper.php in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php

CrossCheckTest::testCrossCheck in drupal/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Tests/CrossCheckTest.php

@dataProvider crossCheckLoadersDumpers

class Dumper {

  /**
   * The amount of spaces to use for indentation of nested nodes.
   *
   * @var integer
   */
  protected $indentation = 4;

  /**
   * Sets the indentation.
   *
   * @param integer $num The amount of spaces to use for indentation of nested nodes.
   */
  public function setIndentation($num) {
    $this->indentation = (int) $num;
  }

  /**
   * Dumps a PHP value to YAML.
   *
   * @param mixed   $input                  The PHP value
   * @param integer $inline                 The level where you switch to inline YAML
   * @param integer $indent                 The level of indentation (used internally)
   * @param Boolean $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
   * @param Boolean $objectSupport          true if object support is enabled, false otherwise
   *
   * @return string  The YAML representation of the PHP value
   */
  public function dump($input, $inline = 0, $indent = 0, $exceptionOnInvalidType = false, $objectSupport = false) {
    $output = '';
    $prefix = $indent ? str_repeat(' ', $indent) : '';
    if ($inline <= 0 || !is_array($input) || empty($input)) {
      $output .= $prefix . Inline::dump($input, $exceptionOnInvalidType, $objectSupport);
    }
    else {
      $isAHash = array_keys($input) !== range(0, count($input) - 1);
      foreach ($input as $key => $value) {
        $willBeInlined = $inline - 1 <= 0 || !is_array($value) || empty($value);
        $output .= sprintf('%s%s%s%s', $prefix, $isAHash ? Inline::dump($key, $exceptionOnInvalidType, $objectSupport) . ':' : '-', $willBeInlined ? ' ' : "\n", $this
          ->dump($value, $inline - 1, $willBeInlined ? 0 : $indent + $this->indentation, $exceptionOnInvalidType, $objectSupport)) . ($willBeInlined ? "\n" : '');
      }
    }
    return $output;
  }

}