arrays - PHP Iterator Custom Sort Order (Laravel 4) -

i have "post" object, accessed via ioc container. various errors tell me object's type ends "collection", implements several interfaces, including iteratoraggregate , arrayaccess.

i want display user-defined group of posts according specific order, e.g.:

$desired=array("69","63","70");//these represent post id's 

just sorting array in manner seems complex, want sort collection. have been researching various combinations of usort(), uksort(), eloquent's sortby(), array_multisort()... obvious solutions result in orders 3,2,1 or 1,2,3, not 2,1,3.

the closest have gotten goal fetch ones want,

//blogcontroller private function myposts($desired){     $posts=$this->post->wherein('id',$desired)->get();     ... 

"convert" collection object array,

$posts=$posts->toarray(); 

and treat array custom function: source

function sortarraybyarray($array,$orderarray) {     $ordered = array();     foreach($orderarray $key) {         if(array_key_exists($key,$array)) {             $ordered[$key] = $array[$key];             unset($array[$key]);         }     }     return $ordered + $array; } $sorted=sortarraybyarray($array1,$desired); 

i can vardump array in correct order, since array, can't access $posts object in view. can convert array post object?

this whole approach feels wasteful anyway, converting array , back... it? there more straightforward way of sorting contents of "collection"?

this little better, perhaps (a native php function):

array_multisort($desired,$posts,sort_string); //only works string keys //$desire=(1,2,3) not work! 

again, works arrays, attempting directly on "posts" object fails...

finally, discovered using presenter: https://github.com/robclancy/presenter#array-usage works in view, after 1 of above completed in controller:

@foreach($posts $post) <?php $post=new postpresenter($post) ?> {{view::make('site.post.article')->with(compact('post'))}} @endforeach 

this works, still feels long way it. there better way accomplish task? performance concerns or best practices 1 method vs. another? in advance able help.

you can use collections own sort method , pass in callback. callback compares every 2 values in collection tells sort method 1 "higher". sort method sorts them accordingly. if want specific value order create mapping , sort that. more info check uasort

$posts->sort(function($a, $b){     $desired=array("69" => 0,"63" => 1,"70" =>2);     if(!array_key_exists($a,$desired) || !array_key_exists($b,$desired) || $a == $b){         return 0     }     else{         return ($desired[$a] < $desired[$b]) ? -1 : 1;     } });