Sorting Array by an added variable - php

Question

Adding a variable to the end of a mysql query.
Now I need to be able to sort by the associated value. Can someone help? I have tried several different sorting methods.
$result2 = mysqli_query($datacon,
"SELECT * FROM spreadsheet
WHERE brand = '$brand'
AND package = '$package'
AND HIDE_FROM_SEARCH = '0'
GROUP BY ACCTNAME $pages->limit");
echo mysqli_error($datacon);
while($row = mysqli_fetch_array($result2)) {
$lat_B=$row['LATITUDE'];
$long_B=$row['LONGITUDE'];
$lat_A = round($lat_A,2);
$long_A = round($long_A,2);
$lat_B = round($lat_B,2);
$long_B = round($long_B,2);
$distance = new calcDist($lat_A, $long_A, $lat_B, $long_B);
$distance = $distance->calcDist($lat_A, $long_A, $lat_B, $long_B);
$distance = round($distance,2);
$locationSort=array($row);
$locationSort['distance']=$distance;
FOR EACH SOMETHING?
}
I have amended my previous post to reflect my usage of an answer.
$result2 = mysqli_query($datacon,"SELECT * FROM spreadsheet WHERE brand = '$brand'
AND package = '$package' and HIDE_FROM_SEARCH = '0' GROUP BY ACCTNAME $pages->limit");
echo(mysqli_error($datacon));
class sortBydistance
{
function sortBydistance($a, $b) {
if ($a['distance'] == $b['distance']) {
return 0;
}
return ($a['distance'] < $b['distance']) ? -1 : 1;
}
}
while($row = mysqli_fetch_array($result2))
{
$lat_B=$row['LATITUDE'];
$long_B=$row['LONGITUDE'];
$lat_A = round($lat_A,2);
$long_A = round($long_A,2);
$lat_B = round($lat_B,2);
$long_B = round($long_B,2);
$distance = new calcDist($lat_A, $long_A, $lat_B, $long_B);
$distance = $distance->calcDist($lat_A, $long_A, $lat_B, $long_B);
$distance = round($distance,2);
}
$locationSort=array($row);
$locationSort['distance']=$distance;
uasort($locationSort, array($this, "sortBydistance"));
print_r($locationSort);

Answer 1

Probably you are not retrieving correctly the $bran and $package variables..
$result2 = mysqli_query($datacon,
"SELECT * FROM spreadsheet
WHERE brand = '".$brand."'
AND package = '".$package."'
AND HIDE_FROM_SEARCH = '0'
GROUP BY ACCTNAME ".$pages->limit.");

Answer 2

First, create your array of entries, and store it in an array, we will call $rows.
You want to use the PHP function usort here to provide a custom sorting callback.
Let's say you have an array like the following:
$rows = array(
array("latitude" => 5, "distance" => 10),
array("latitude" => 10, "distance" => 5),
array("latitude" => 56, "distance" => 48)
);
You expect this array of $rows to be reordered so that the entry with latitude == 10 is first, latitude == 5 is second, and latitude == 56 is third, based on their distance.
usort($rows, function ($a, $b) {
$a = $a['distance'];
$b = $b['distance'];
return $a == $b ? 0 : $a > $b ? 1 : -1;
});
Output
Array
(
[0] => Array
(
[latitude] => 10
[distance] => 5
)
[1] => Array
(
[latitude] => 5
[distance] => 10
)
[2] => Array
(
[latitude] => 56
[distance] => 48
)
)
See this demonstration at ideone.com
Alternatively, you could try to find a SortedArray implementation that would keep the elements sorted as they were inserted to the array, rather than only when you call usort() on the array. That's a little too advanced for this question, though.

Answer 3

Try this after your while loop:
uasort($locationSort, 'sortBydistance');
// or uasort($locationSort, array($this, "sortBydistance")); if you are using withing a class
print_r($locationSort);
function sortBydistance($a, $b) {
if ($a['distance'] == $b['distance']) {
return 0;
}
return ($a['distance'] < $b['distance']) ? -1 : 1;
}