Question 40126 in PHP Question posted in
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PHP group by similar value called by function

I have an element with title, type, description and so on. I have a DAO that defines all that and functions already created that extract the type for one element only: it’s getById().

How can I loop through all the elements and create groups of them by the same id?

$group = array();
foreach ($announcement as $announcements) {
    $announcementType = $this->getById($this->typeId());
}

I should put an "if" here, but I cannot understand how to "create a group for each elements with the same typeId".

Tags:

2

Answers


  1. 0

    It’s not clear why you cycle over $announcements, anyway you can try a solution like this:

    $group = [];

foreach ($announcements as $announcement) {
   $id = $this->typeId();
   $group[$id][] = $this->getById($id);
}
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  2. 0

    You can also try with array_reduce (is not an common answer but still an answer):

    //Considering every announcement has an id


$callback = function($prevResult, $item) { 
    $id = $item->typeId();
    $prevResult[$id][] = $this->getById($id);
    return $prevResult;
};

$groupedById = array_reduce($announcements, $callback, []);
//empty array as last parameter if the announcements 
//array is empty os the return type still the same
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