Setter / Getter Best Practice 2016

I have been doing this (see below) for sometime and wanted to know if this would be considered best practice for a PHP setter/getter function?

PHP Code:

public function plugin_prefix($prefix=null) {
  /* return value if no value sent in */
  if ($prefix === null) {
   return $this->plugin_prefix;
  }

  /* set file extension */
  $this->plugin_prefix = $prefix;

  /* chain-able */
  return $this;
} 


This allows me to set multiple settings using

PHP Code:

$this->my_object->plugin_prefix('foo')->extension('bar')->something_else('foobar'); 


and get a value with

PHP Code:

$plugin = $this->my_object->plugin_prefix(); 


I look forward to your comments...

DMyers

https://github.com/ProjectOrangeBox / https://github.com/dmyers2004