call_user_func_array with array_multisort [duplicate] - php

Question

This question already has answers here:
Sort array using array_multisort() with dynamic number of arguments/parameters/rules/data
(5 answers)
Closed 2 years ago.
I have the problem with sort direction. I try to sort multi-dimensional array with direction. I can't use array_multisort() directly, because I don't know how many parametrs will be. I use call_user_func_array('array_multisort', $params); And it works, but I can't set sort direction (SORT_ASC,SORT_DESC). How can I set sort direction for call_user_func_array('array_multisort', $params);?
Here is my code, you can try it
function get_fields($data, $order_by) {
$order_row = preg_split("/[\s,]+/", $order_by);
for ($i=0;$i<count($order_row);$i++) {
foreach ($data as $key => $row) {
$tmp[$i][$key] = $row[$order_row[$i]];
}
}
return $tmp;
}
function ordering($data, $order_by) {
$tmp = get_fields($data, $order_by);
$params = array();
foreach($tmp as &$t){
$params[] = &$t;
}
$params[1] = array("SORT_DESC","SORT_DESC","SORT_DESC","SORT_DESC"); // like that no warning but no sorting
$params[] = &$data;
call_user_func_array('array_multisort', $params);
return array_pop($params);
}
$data = array (
array('id' => 1,'name' => 'Barack','city' => 9),
array('id' => 7,'name' => 'boris','city' => 2),
array('id' => 3,'name' => 'coris','city' => 2),
array('id' => 3,'name' => 'coris','city' => 2)
);
$order_by = "city desc, name";
echo "<br>ORDER BY $order_by<br>";
$ordered = ordering($data, $order_by);
echo "<pre>";
var_dump($ordered);
echo "</pre>";
I want to do a sort like MySQL ORDER BY city DESC, name. It's my goal.

Answer 1

To be able to sort an array multiple times and achieve a result like ORDER BY city DESC, name ASC you need a function that does a stable sort.
As far as I know PHP doesn't have one so you have to sort it once with a comparator function like this
$data = array (
array('id' => 3,'name' => 'coris','city' => 2),
array('id' => 1,'name' => 'Barack','city' => 9),
array('id' => 7,'name' => 'boris','city' => 2),
array('id' => 3,'name' => 'coris','city' => 2),
);
$order_by = array(
'city' => array('dir' => SORT_DESC, 'type' => SORT_NUMERIC),
'name' => array('dir' => SORT_ASC, 'type' => SORT_STRING),
);
function compare($row1,$row2) {
/* this function should determine which row is greater based on all of the criteria
and return a negative number when $row1 < $row2
a positive number when $row1 > $row2
0 when $row1 == $row2
*/
global $order_by;
foreach($order_by as $field => $sort) {
if($sort['type'] != SORT_NUMERIC) {
// strings are compared case insensitive and assumed to be in the mb_internal_encoding
$cmp = strcmp(mb_strtolower($row1[$field]), mb_strtolower($row2[$field]));
} else {
$cmp = doubleval($row1[$field]) - doubleval($row2[$field]);
}
if($sort['dir'] != SORT_ASC) $cmp = -$cmp;
if($cmp != 0) return $cmp;
}
return 0;
}
usort($data,'compare');

Answer 2

I had the same problem. It seems that call_user_func_array() can't handle the constants.
I've solved this problem by dynamically building an argument string and evaluating this string:
$args = array($arr1, $arr2);
$order = array(SORT_ASC, SORT_DESC);
$evalstring = '';
foreach($args as $i=>$arg){
if($evalstring == ''){ $evalstring.= ', '; }
$evalstring.= '$arg';
$evalstring.= ', '.$order[$i];
}
eval("array_multisort($evalstring);");
I know eval() is evil and this is not a clean way, but it works ;-)

Answer 3

It is working for me :
$arrayThatNeedToSort = array('data..');
$multiSortprop = array(['data.....']=> SORT_DESC,['data.....'] => SORT_ASC)
$properties = array();
foreach ($multiSortprop as $sortArr => $sortArg) {
array_push($properties,$sortArr);
array_push($properties,$sortArg);
}
array_push($properties,$arrayThatNeedToSort);
array_multisort(...$properties);
var_dump(end($properties));