Adldap\Schemas\SchemaInterface::distinguishedName PHP Method

    public function distinguishedName();

 /**
  * Sets an attributes value by the specified key and sub-key.
  *
  * @param int|string $key
  * @param mixed      $value
  * @param int|string $subKey
  *
  * @return $this
  */
 public function setAttribute($key, $value, $subKey = null)
 {
     // Normalize key.
     $key = $this->normalizeAttributeKey($key);
     // If the key is equal to 'dn', we'll automatically
     // change it to the full attribute name.
     $key = $key == 'dn' ? $this->schema->distinguishedName() : $key;
     if (is_null($subKey)) {
         $this->attributes[$key] = is_array($value) ? $value : [$value];
     } else {
         $this->attributes[$key][$subKey] = $value;
     }
     return $this;
 }