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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Functions for dealing with question hotness in the database
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
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../../');
exit;
}
/**
* Increment the views counter for the post (if different IP from last view).
* @param int $postid The ID of the post
* @return bool Whether views were actually incremented.
*/
function qa_db_increment_views($postid)
{
$query = 'UPDATE ^posts SET views=views+1, lastviewip=UNHEX(?) WHERE postid=? AND (lastviewip IS NULL OR lastviewip!=UNHEX(?))';
$ipHex = bin2hex(@inet_pton(qa_remote_ip_address()));
$result = qa_service('database')->query($query, [$ipHex, $postid, $ipHex]);
return $result->affectedRows() > 0;
}
/**
* Recalculate the hotness in the database for one or more posts.
*
* @param int $firstpostid First post to recalculate (or only post if $lastpostid is null).
* @param int $lastpostid Last post in the range to recalculate.
* @param bool $viewincrement Deprecated - view counter is now incremented separately. Previously, would increment the
* post's views and include that in the hotness calculation.
* @return mixed
*/
function qa_db_hotness_update($firstpostid, $lastpostid = null, $viewincrement = false)
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
if (!qa_should_update_counts()) {
return;
}
if (!isset($lastpostid))
$lastpostid = $firstpostid;
$query = "UPDATE ^posts AS x, (SELECT parents.postid, MAX(parents.created) AS qcreated, COALESCE(MAX(children.created), MAX(parents.created)) as acreated, COUNT(children.postid) AS acount, MAX(parents.netvotes) AS netvotes, MAX(parents.views) AS views FROM ^posts AS parents LEFT JOIN ^posts AS children ON parents.postid=children.parentid AND children.type='A' WHERE parents.postid BETWEEN # AND # GROUP BY postid) AS a SET x.hotness=(" .
'((TO_DAYS(a.qcreated)-734138)*86400.0+TIME_TO_SEC(a.qcreated))*# + ' . // zero-point is Jan 1, 2010
'((TO_DAYS(a.acreated)-734138)*86400.0+TIME_TO_SEC(a.acreated))*# + ' .
'(a.acount+0.0)*# + ' .
'(a.netvotes+0.0)*# + ' .
'(a.views+0.0)*#' .
') WHERE x.postid=a.postid';
// Additional multiples based on empirical analysis of activity on Q2A meta site to give approx equal influence for all factors
$arguments = array(
$firstpostid,
$lastpostid,
qa_opt('hot_weight_q_age'),
qa_opt('hot_weight_a_age'),
qa_opt('hot_weight_answers') * 160000,
qa_opt('hot_weight_votes') * 160000,
qa_opt('hot_weight_views') * 4000,
);
qa_db_query_raw(qa_db_apply_sub($query, $arguments));
}