> $this->result_header = ob_get_contents();

That line should be something like:
            $this->result_header($ch, $string);

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GS/S d- s: a-29 C++(+++) ULAHI+++ P+ L++>+++ E--- W++ N* o-- K- w++++
O- M-- V-- PS+ PE Y-- PGP++ t- 5- X+ R tv++ b+ DI+++ D- G++ e++ h+ r+
z**
------END GEEK CODE BLOCK------
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