original_string: public function getCallback($env = null)
      {
          $env = $env ?: $this->running_env;
          return isset($this->callbacks[$env]) ? $this->callbacks[$env] : null;
      }
code: public function getCallback($env = null)
      {
          $env = $env ?: $this->running_env;
          return isset($this->callbacks[$env]) ? $this->callbacks[$env] : null;
      }
code_tokens: public function getCallback ( $ env = null ) { $ env = $ env ? : $ this -> running_env ; return isset ( $ this -> callbacks [ $ env ] ) ? $ this -> callbacks [ $ env ] : null ; }
docstring: Returns the callback that will be called when an error is handled
  
  Uses the currently running environment when none is given.
  
  @param  string|null $env Name of the environment
  
  @return callable
docstring_tokens: Returns the callback that will be called when an error is handled