Файл: qa-include/qa-util-sort.php
Строк: 110
<?php
/*
Question2Answer (c) Gideon Greenspan
http://www.question2answer.org/
File: qa-include/qa-util-sort.php
Version: See define()s at top of qa-include/qa-base.php
Description: A useful general-purpose 'sort by' function
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;
}
function qa_sort_by(&$array, $by1, $by2=null)
/*
Sort the $array of inner arrays by sub-element $by1 of each inner array, and optionally then by sub-element $by2
*/
{
global $qa_sort_by_1, $qa_sort_by_2;
$qa_sort_by_1=$by1;
$qa_sort_by_2=$by2;
uasort($array, 'qa_sort_by_fn');
}
function qa_sort_by_fn($a, $b)
/*
Function used in uasort to implement qa_sort_by()
*/
{
global $qa_sort_by_1, $qa_sort_by_2;
$compare=qa_sort_cmp($a[$qa_sort_by_1], $b[$qa_sort_by_1]);
if (($compare==0) && $qa_sort_by_2)
$compare=qa_sort_cmp($a[$qa_sort_by_2], $b[$qa_sort_by_2]);
return $compare;
}
function qa_sort_cmp($a, $b)
/*
General comparison function for two values, textual or numeric
*/
{
if (is_numeric($a) && is_numeric($b)) // straight subtraction won't work for floating bits
return ($a==$b) ? 0 : (($a<$b) ? -1 : 1);
else
return strcasecmp($a, $b); // doesn't do UTF-8 right but it will do for now
}
function qa_array_insert(&$array, $beforekey, $addelements)
/*
Inserts $addelements into $array, preserving their keys, before $beforekey in that array.
If $beforekey cannot be found, the elements are appended at the end of the array.
*/
{
$newarray=array();
$beforefound=false;
foreach ($array as $key => $element) {
if ($key==$beforekey) {
$beforefound=true;
foreach ($addelements as $addkey => $addelement)
$newarray[$addkey]=$addelement;
}
$newarray[$key]=$element;
}
if (!$beforefound)
foreach ($addelements as $addkey => $addelement)
$newarray[$addkey]=$addelement;
$array=$newarray;
}
/*
Omit PHP closing tag to help avoid accidental output
*/