Question

I have an array with academic years:

$arrayAcademicYears = array( 
           array("8889", "1988-1989"),
           array("8990", "1989-1990"),
           array("9091", "1990-1991"),
           array("0405", "2004-2005"),
           array("1112", "2011-2012"),
           array("1213", "2012-2013")
         );
         foreach($arrayAcademicYears as $k => $v) {
             echo "KEY: ";
             echo $v[0];
             echo " -> VALUE: ";
             echo $v[1];
             echo "<br>";
         }

This prints:

KEY: 8889 -> VALUE: 1988-1989
KEY: 8990 -> VALUE: 1989-1990
KEY: 9091 -> VALUE: 1990-1991
KEY: 0405 -> VALUE: 2004-2005
KEY: 1112 -> VALUE: 2011-2012
KEY: 1213 -> VALUE: 2012-2013

Then I have the current academic year in a variable like this:

$currentAcademicYear="1112";

How can I change the code to print:

KEY: 1112 -> VALUE: 2011-2012
KEY: 1213 -> VALUE: 2012-2013
KEY: 0405 -> VALUE: 2004-2005
KEY: 9091 -> VALUE: 1990-1991
KEY: 8990 -> VALUE: 1989-1990
KEY: 8889 -> VALUE: 1988-1989

Please note that this is just an example, I’m not asking for a solution to any kind of academic course exercise. Just a self taught PHP learner here.

Thanks a lot! (.. for helping me becoming a better PHP programmer :))

Answer 1

This will reverse your array, displaying the newest first:

$arrayAcademicYears = array_reverse($arrayAcademicYears);

Place it just above:

foreach($arrayAcademicYears as $k => $v) {

Array_reverse will for some reason change the key’s on all your items to 0 increment, except for the 04-05 year. Use the following function which is updated and will achieve the correct sorting.

    function array_mtf(&$arr, $keytom, $reverse = false){
        $tmp = array();
        foreach($arr as $key => $value){
            if($key == $keytom){
                $tmp[$key] = $value;
                unset($arr[$key]);
            }
        }

                    if($reverse)
            arsort($arr);

        $arr = $tmp + $arr;
    }

Usage would be as:

array_mtf($array_to_sort, $key_to_move_first, true);    

So add the function block to your code, and then replace:

$arrayAcademicYears = array_reverse($arrayAcademicYears);

With

array_mtf($arrayAcademicYears, $currentAcademicYear);   

The resulting array would look like:

Array
(
[1112] => 2011-2012
[1213] => 2012-2013
[0405] => 2004-2005
[9091] => 1990-1991
[8990] => 1989-1990
[8889] => 1988-1989
)