What does $this generally mean in PHP? -

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i new php, kind of confused seeing these different operators day. here code came across when watching video tutorail, i'd appreciate if explain little bit:

class email extends ci_controller {  function __construct() {     parent::__construct(); }     function index()     {     $config = array(         'protocol'    => 'smtp',         'smtp_host' => 'ssl://smtp.googlemail.com',         'smtp_port'  => 465,         'smtp_user' => 'username@gmail.com',         'smtp_pass' =>'password',     );         $this->load->library('email', $config);         $this->email->set_newline("\r\n");          $this->email->from('username@gmail.com', 'jerry');         $this->email->to('username@gmail.com');         $this->email->subject('this email test');         $this->email->message('this test message!');          if($this->email->send())         {             echo 'your email sent';         }         else          {             show_error($this->email->print_debugger());         }     }      ...

in case, function index part of class. index function accessing other objects member values of same class. in order access member values, have use pseudo-variable $this. $this refers object in.

for exmaple:

$this->email->subject('this email test');

translated: call "subject function" email object, member of object.


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