Sorting an array with a delimiter

[DaltonRandall]

Hi there,

 

Let's say I have the following array:

Array
(
    [1] => 4224:3
    [2] => 4407:6
    [3] => 4403:5
    [4] => 4190:4
    [5] => 4194:2
    [6] => 4185:1
)

I want to sort it based on what follows the colon ( : ) in each value.  For example, I would like the result to be:

Array
(
    [6] => 4185:1
    [5] => 4194:2
    [1] => 4224:3
    [4] => 4190:4
    [3] => 4403:5
    [2] => 4407:6
)

I have found some code to allow me to sort the array as such, but it is resetting all of the keys (which are very important).  Does anyone have an efficient way to help me sort the array while keeping the key and value relationship intact?

 

Thanks a bunch in advance for any help!

[requinix]

Post your code. If I'm right, taking what you have now and making it work the way you want could be as simple as typing a single character.

[DaltonRandall]

function cmp($a, $b) 

{ 

    $pieces_a = explode(":", $a); 

    $pieces_b = explode(":", $b); 


    if(!isset($pieces_a[1]) && isset($pieces_b[1])) { 

        return 1; 

    } 

    elseif(!isset($pieces_b[1]) && isset($pieces_a[1])) { 

        return -1; 

    } 

    elseif(!isset($pieces_a[1]) && !isset($pieces_b[1])) { 

        return 0; 

    } 


    if(substr($pieces_a[1], 0, 1) == '0') { 

        return 1; 

    } 

    elseif(substr($pieces_b[1], 0, 1) == '0') { 

        return -1; 

    } 


    $a = substr($pieces_a[1], 0, 1); 

    $b = substr($pieces_b[1], 0, 1); 


    return strcasecmp($a, $b); 

} 

 

[DaltonRandall]

And this is the call:

usort($sample_array, "cmp");

[kicken]

Indeed, requinix's theory is correct. You just need to be using uasort instead of usort.

 

uasort:

Sort an array with a user-defined comparison function and maintain index association

[DaltonRandall]

Sorry for my ignorance/stupidity.  Thank you for the quick replies. <3