$array[0]="25 3 7";  #computed value 3*7=21
$array[1]="68 4 6";  #computed value 4*6=24;
$array[2]="23 2 3";  #computed value 2*3=6;
magic_sort(@array);  #our to be determined sort function;
#after our sort
#$array[0] is "23 2 3";  
#$array[1] is "25 3 7";
#$array[2] is "68 4 6";