You can pass variables from your PHP page directly into the email. It would look something like this.
$params = array(
'username' => $userdetails->username,
'sitename' => $settings->site_name,
'fname' => $userdetails->fname,
'email' => rawurlencode($userdetails->email),
'vericode' => $userdetails->vericode,
'reset_vericode_expiry' => $settings->reset_vericode_expiry
);
$to = rawurlencode($userdetails->email);
$subject = 'Password Reset';
$body = email_body('_email_adminPwReset.php',$params);
email($to,$subject,$body);