PageArray Sort by ID entry

[Tom.]

Here is a difficult one for you guys. 

I'm wanting to do a page step sort of thing. I'm creating an online repository where everything will be relationship based. I've created a page and template that will hold "Journeys" these "Journeys" have a Journey start field and a Journey field.

When a page is hit with Journey_start matched it will look at the Journey field to look at what pages should follow on to that. This is then set in a session:

$journey = $pages->findOne("template=journey, journey_start=$page")->journey;
if($journey->count) { 
     $journey = $journey->prepend($page);
     $session->journey = (string) $journey;
}

What it will do from here is check if the current page is part of the session, if it isn't reset the session. This is because a page can be part of a Journey but also the start of a Journey. So if you go away from the intended Journey it will reset ready to start a new one. 

So once it's on the next Journey page it does the following: 

if($journey->count) { 
     $journey = $journey->prepend($page);
     $session->journey = (string) $journey;
} else {
     $journey = $pages->find("id=$session->journey");
}

However this will return a random order and not the order the id's are set. Throwing the pagination out:

$inArray = false;
foreach($journey as $item) {
    if($item == $page) {
        $prev = $journey->getPrev($item);
        $next = $journey->getNext($item);
        echo "<a href='$prev->url'>$prev->title</a>";
        echo "<a href='$next->url'>$next->title</a>";
        $inArray = true;
     }
}
if(!$inArray) {
     $session->journey = '';
}

Anyone got any ideas? Am I going about this all wrong?

I believe if I can use $pages->find to return the pages in the order of id's set, it should work. 

[LostKobrakai]

$journeyArray = $journey->getArray();

$idArray = explode("|", $session->journey);

usort($journeyArray, function($a, $b) use ($idArray) {

$keyA = array_search($a->id, $idArray);

$keyB = array_search($b->id, $idArray);

return $keyA < $keyB ? -1 : 1;

});

$journey->setArray($journeyArray);

[Tom.]

$journeyArray = $journey->getArray();
$idArray = explode("|", $session->journey);

usort($journeyArray, function($a, $b) use ($idArray) {
  $keyA = array_search($a->id, $idArray);
  $keyB = array_search($b->id, $idArray);

  return $keyA < $keyB ? -1 : 1;
});

$journey->setArray($journeyArray);

Thank you very much, that worked. I can't say I understand what's going off there, but it worked! I'll will take some time to research it and figure it out  

[LostKobrakai]

PageArrays are internally just simple arrays and that code is retrieving that array, sorting it to fit the order of the stored id's and then setting it back to the PageArray. How usort works is quite nicely described in the php docs.