Sort array by key

Question

I have one array

$a = array(    0=>'test', 1=>'test some', 10=>'test10',
               2=>'test2', '11'=>'test value',22=>'test abc'
         );

I need to sort it like

0 => test
1 => test some
10 => test 10
11 => test value
2 => test2
22 => test abc

How can i able to do this?

I tried ksort but it not work as per my requirement

ksort result

Array
(
    [0] => test
    [1] => test1
    [2] => test2
    [10] => test10
    [11] => test11
    [22] => test22
)

Possible duplicate of [Reference: all basic ways to sort arrays and data in PHP](http://stackoverflow.com/questions/17364127/reference-all-basic-ways-to-sort-arrays-and-data-in-php) — Epodax, Oct 01 '15 at 07:03
If all the keys were strings like the key '11' ksort (with SORT_STRING flag) will work as you wanted. — David Lopez, Oct 01 '15 at 07:10

score 3 · Accepted Answer · answered Oct 01 '15 at 07:17

This should work:

$a = array(0=>'test', 1=>'test1', 10=>'test10', 2=>'test2', '11'=>'test11', 22=>'test22');
ksort($a, SORT_STRING);
print_r($a)

Output:

Array
(
    [0] => test
    [1] => test1
    [10] => test10
    [11] => test11
    [2] => test2
    [22] => test22
)

Rohit Kumar · Answer 2 · 2015-10-01T07:28:54.770

You can achive this by using uksort to get desired result .The uksort() function sorts an array by keys using a user-defined comparison function.

$a= array(    0=>'test', 1=>'test1', 10=>'test10',
               2=>'test2', '11'=>'test11',22=>'test22'
         );
function my_sort($a,$b)
{
if ($a==0) return 0;
return (substr($a, 0, 1)<substr($b, 0, 1))?-1:1;
}

uksort($a,"my_sort");
print_r($a);

Output

 Array ( [0] => test 
[1] => test1 
[10] => test10 
[11] => test11 
[2] => test2 
[22] => test22 )

Sort array by key

2 Answers2