Sort multidimensional Array with an index - php

Question

I have the following array and I want to sort all the records with total in descending order. Can anyone tell me the php code or pseudo code for doing it.
Array
(
[reg_id] => Array
(
[0] => 5
[1] => 7
[2] => 17
[3] => 18
[4] => 19
[5] => 20
[6] => 34
)
[name] => Array
(
[0] => employee1
[1] => employee6
[2] => employee3
[3] => employee4
[4] => employee2
[5] => empoyee5
[6] => employee9
)
[test_w] => Array
(
[0] => 21/30
[1] => 15/30
[2] => 27/30
[3] => 16.5/30
[4] => 21/30
[5] => 18/30
[6] => 12/30
)
[intr_w] => Array
(
[0] => 8/10
[1] => 6/10
[2] => 9/10
[3] => 9/10
[4] => 3.3/10
[5] => 7/10
[6] => 0/10
)
[exp_w] => Array
(
[0] => 2.5/5
[1] => 4/5
[2] => 4.35/5
[3] => 4.5/5
[4] => 4.8/5
[5] => 4.5/5
[6] => 0/5
)
[educ_w] => Array
(
[0] => 37.41/55
[1] => 44.14/55
[2] => 33.27/55
[3] => 38.43/55
[4] => 34.52/55
[5] => 46.11/55
[6] => 43.66/55
)
[total] => Array
(
[0] => 68.91
[1] => 69.14
[2] => 73.62
[3] => 68.43
[4] => 63.62
[5] => 75.61
[6] => 55.66
)
)

Answer 1

Use this function should solve the problem
function multisort($array, $key, $sort_flags = SORT_REGULAR) {
if (is_array($array) && count($array) > 0) {
if (!empty($key)) {
$mapping = array();
foreach ($array as $k => $v) {
$sort_key = '';
if (!is_array($key)) {
$sort_key = $v[$key];
} else {
// #TODO This should be fixed, now it will be sorted as string
foreach ($key as $key_key) {
$sort_key .= $v[$key_key];
}
$sort_flags = SORT_STRING;
}
$mapping[$k] = $sort_key;
}
asort($mapping, $sort_flags);
$sorted = array();
foreach ($mapping as $k => $v) {
$sorted[] = $array[$k];
}
return $sorted;
}
}
return $array;
}
For Example:
$result=multisort($array,$sort_flags = DESC);

Answer 2

The simplest (but least efficient) would be a simple bubble sort
Pseudo code
for( $i from 0 to count($arr[total])):
for( $j from 0 to count(...)):
if($arr[total][$i] < $arr[total][$j]):
//SWAP VALUES AT i AND j
$this->swap($arr[total][$i],$arr[total][$j]);
$this->swap($arr[name][$i],$arr[name][$j]);
$this->swap($arr[reg_id][$i],$arr[reg_id][$j]);
// etc for all required fields
endif;
endfor;
endfor;
SWAP FUNCTION (PASS VALUES BY REFERENCE SO THEY WILL GET CHANGED)
function swap(&$i, &$j){
$t=$i;
$i=$j;
$j=$t;
}

Answer 3

Since those seem to be fields related to an entity, the best answer I can give you is to build better data structures. By example, you should build an Employee (or whatever entity you are representing there) class containing those fields:
class Employee
{
public $reg_id;
public $name;
public $test_w;
public $intr_w;
public $exp_w;
public $educ_w;
public $total;
}
and then keep an array of Employee's. What if you had another field that in turn was an array? I know my answer doesn't address the actual sorting, I'm just saying your way of keeping the data can get really dirty really quick.

Answer 4

I have sort array with the following function.
function msort($array, $key_s) {
$arraynew = $array;
foreach($array as $key=>$val){
if($key == $key_s){
for($i=0; $i<count($val); $i++){
for($j=0; $j<count($val); $j++){
if($val[$i] > $val[$j]){
$temp = $val[$i];
$val[$i] = $val[$j];
$val[$j] = $temp;
// swap all values
foreach($arraynew as $arrKey=>$arrVal){
$temp = $arraynew[$arrKey][$i];
$arraynew[$arrKey][$i] = $arraynew[$arrKey][$j];
$arraynew[$arrKey][$j] = $temp;
}
}
}
}
}
}
return $arraynew;
}