How to use "$this->profile->userinfo['userid']"

[identitas]

I trying to import some data from the database to include on memberinfo, but i dont get $this->profile->userinfo['userid'] to work.

Any file i need to include?

I have created a plugin with hook member_build_blocks_start with the code:

PHP Code:

$pfr_res = $db->query_first("SELECT `field6` FROM `" . TABLE_PREFIX . "userfield` WHERE `userid` = ' . $this->profile->userinfo['userid'] . ' LIMIT 1");
$pfr_profile = $pfr_res['field6'];
vB_Template::preRegister('MEMBERINFO',array('prf_profile' => $prf_profile)); 


But only get blank screen. What to do?

[identitas]

Fixed it with $prepared['userid'] instead.

[gibigbig]

thank you very much for this.