php sort array in desired order by key

Function ksort() is the best while you use the sorting by key.

Check the different sort options available in PHP.

Sort based on array keys - http://us3.php.net/ksort

You can also sort based on your own comparison function - http://us3.php.net/manual/en/function.uksort.php

There Are a number of array functions in Php and They are all discussed on PHP Official websites. As for I understand you are looking for ksort (Sort Array By keys) and krsort (Sort Array By Keys In Reverse). Please Check them on the given links. And try it yourself.. Goodluck

You can also create your own custom function to do the required job and use it anytime within your application if you feel ksort and krsort are not flexible or accurate to your requirement.

There are few ways using some php sort functions (like other guys already sugessted), this is another short way how to do this job.

function sortArrayByKeys()

function sortArrayByKey($keystring, $origarray) {
  $res = array();
  $keys = explode(',', $keystring);
  foreach ($keys as $key) $res[] = $origarray[$key];
  return $res;
  }

test:

$original_array = array('A', 'B', 'C', 'D', 'E', 'F');

$sort_pattern = '5,2,4,1,3,0';
$new_array = sortArrayByKey($sort_pattern, $original_array);
echo "$sort_pattern => " . join(',', $new_array) . "<br />\n";

$sort_pattern = '0,2,4,1,3,5';
$new_array = sortArrayByKey($sort_pattern, $original_array);
echo "$sort_pattern => " . join(',', $new_array) . "<br />\n";

$sort_pattern = '5,4,3,2,1,0';
$new_array = sortArrayByKey($sort_pattern, $original_array);
echo "$sort_pattern => " . join(',', $new_array) . "<br />\n";

$sort_pattern = '0,5,4,2,1,3';
$new_array = sortArrayByKey($sort_pattern, $original_array);
echo "$sort_pattern => " . join(',', $new_array);

output:

5,2,4,1,3,0 => F,C,E,B,D,A
0,2,4,1,3,5 => A,C,E,B,D,F
5,4,3,2,1,0 => F,E,D,C,B,A
0,5,4,2,1,3 => A,F,E,C,B,D

Cheers ;)