php - How to reference an object from inside a private function -

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i using mixpanel's php api , want call mp->track.

in case, mp->track defined object in mixpanel library, called via require(mixpanel.php).

typically, work fine:

require ('mixpanel-php/lib/mixpanel.php'); $mp = mixpanel::getinstance("xxx"); $mp->track('session');

however, want call mp->track() within private function, following gives object not defined error:

require ('mixpanel-php/lib/mixpanel.php'); $mp = mixpanel::getinstance("xxx")  private function startsession() {  $mp->track('session');  }

this approach; if define

$mp = mixpanel::getinstance("xxx");

somewhere in class; should use as

$this->mp->track('session');

so code should 

<?php   require ('mixpanel-php/lib/mixpanel.php');    class myclass {     protected $mp;     public function __construct() {       $this->mp = mixpanel::getinstance("xxx");     }      private function startsession() {       $this->mp->track('session');     }    } ?>

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