gistfile1.php

<?php
    function get_html_contents($full_url) {
        return str_get_html($full_url); // simplehtmldom's function
    }

    function get_full_result_block($html) {
        return $html->find('div#center_col', 0);
    }

    function get_topstuff($whole_result) {
        return $whole_result->find('div#topstuff', 0);
    }

    function get_best_guess($topstuff) {
        $best_guess = $this->strstr_after($topstuff->plaintext, 'Best guess for this image:');
        return trim($best_guess, ' ');
    }

    function get_titles_dom($whole_search_result_block) {
        return $whole_search_result_block->find('div#search div#ires ol#rso li.g h3.r');
    }

    function get_span_texts_dom($whole_search_result_block) {
        return $whole_search_result_block->find('div#search div#ires ol#rso li.g span.st');
    }

    function get_first_title($titles_dom) {
        $results_count = count($titles_dom);
        for ($i = 0; $i < $results_count; $i++) {
            $title = $this->filter_out_bad_words($titles_dom[$i]->plaintext);
            if ($title === 'Visually similar images') return null;
            if (str_word_count($title) == 1 & $i + 1 != $results_count) {
                $title .= " ".$this->filter_out_bad_words($titles_dom[$i + 1]->plaintext);
            } else {
                return $title;
            }
        }
        return null;
    }

    function get_first_span_text($span_texts_dom) {
        $results_count = count($span_texts_dom);
        for ($i = 0; $i < $results_count; $i++) {
            $span_text = $this->filter_out_bad_words($span_texts_dom[$i]->plaintext);
            if ($span_text === 'Visually similar images') return null;
            if ($span_text) return $span_text;
        }
        return null;
    }