I have an array of objects, each object has an index: object->index, which is a positive integer.
I have a second array, each entry is an index, corresponding uniquely to one of object->index. I want to sort the first array of objects so that they are in the same order as the order of the second arrays indexes.
Does that make sense?
Thanks.
I would flip your second array (array_flip) so that you can look up an object's desired position more easily. Then you can just iterate through your objects like so:
$indices = array_flip( $second_array );
$sorted_objects = array();
foreach ( $objects as $object ) {
$sorted_objects[$indices[$object->index]] = $object;
}
array_search(). Might also need to ksort($sorted_objects); afterward so it can be iterated in desired order.
$sorted_objects = array_fill( 0, count( $objects ), NULL ); so that objects will be inserted at the proper position instead of appended (I thought that PHP would insert them in the correct order if the keys were numeric, but obviously it does not).$objArray = ...;
$sortArray = ...;
$newArray = array(); // the sorted array
foreach( $sortArray as $index )
{
foreach( $objArray as $obj )
{
if( $obj->index === $index )
{
$newArray[] = $obj;
break;
}
}
}
like this?
Check out usort (http://au.php.net/manual/en/function.usort.php): this allows you to sort an array by specifying a function. That function would be to get the index of the object.
function cmp($obj1, $obj2) {
if ($obj1->index == $obj2->index) {
return 0;
}
return ($obj1->index < $obj2->index) ? -1 : 1;
}
usort($aObjects, "cmp");
