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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Server-side response to Ajax request based on ask a question title
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
require_once QA_INCLUDE_DIR . 'db/selects.php';
require_once QA_INCLUDE_DIR . 'util/string.php';
require_once QA_INCLUDE_DIR . 'app/users.php';
require_once QA_INCLUDE_DIR . 'app/format.php';
// Collect the information we need from the database
$intitle = qa_post_text('title');
$doaskcheck = qa_opt('do_ask_check_qs');
$doexampletags = qa_using_tags() && qa_opt('do_example_tags');
if ($doaskcheck || $doexampletags) {
$countqs = max($doexampletags ? QA_DB_RETRIEVE_ASK_TAG_QS : 0, $doaskcheck ? qa_opt('page_size_ask_check_qs') : 0);
$relatedquestions = qa_db_select_with_pending(
qa_db_search_posts_selectspec(null, qa_string_to_words($intitle), null, null, null, null, 0, false, $countqs)
);
}
// Collect example tags if appropriate
if ($doexampletags) {
$tagweight = array();
foreach ($relatedquestions as $question) {
$tags = qa_tagstring_to_tags($question['tags']);
foreach ($tags as $tag) {
@$tagweight[$tag] += exp($question['score']);
}
}
arsort($tagweight, SORT_NUMERIC);
$exampletags = array();
$minweight = exp(qa_match_to_min_score(qa_opt('match_example_tags')));
$maxcount = qa_opt('page_size_ask_tags');
foreach ($tagweight as $tag => $weight) {
if ($weight < $minweight)
break;
$exampletags[] = $tag;
if (count($exampletags) >= $maxcount)
break;
}
} else {
$exampletags = array();
}
// Output the response header and example tags
echo "QA_AJAX_RESPONSE\n1\n";
echo strtr(qa_html(implode(',', $exampletags)), "\r\n", ' ') . "\n";
// Collect and output the list of related questions
if ($doaskcheck) {
$minscore = qa_match_to_min_score(qa_opt('match_ask_check_qs'));
$maxcount = qa_opt('page_size_ask_check_qs');
$relatedquestions = array_slice($relatedquestions, 0, $maxcount);
$limitedquestions = array();
foreach ($relatedquestions as $question) {
if ($question['score'] < $minscore)
break;
$limitedquestions[] = $question;
}
$themeclass = qa_load_theme_class(qa_get_site_theme(), 'ajax-asktitle', null, null);
$themeclass->initialize();
$themeclass->q_ask_similar($limitedquestions, qa_lang_html('question/ask_same_q'));
}