Create a json object with array of arrays in PHP

Question

I'm using array_add($array, 'key', 'value'); to create the data structure.

foreach ($archives as $archive){
 $results = array_add($results, $archive->year, 
 array($archive->month => array('name' => $archive->month_name)));
}

If i json_encode()the $results i get this output:

{ 
 2015: {
 02: {name:'February'}
 }
}

But i want something like:

{
 2015: {
 02: {name:'February'},
 01: {name:'January'}
 }
}

And of course this should works for different years too.

• Daan: array_add isn't a core php function, can you show the function aswell? Besides $results is overwritten in every iteration.
• Elias Van Ootegem: Why are you using a (IMHO pointless, and messy-looking) function (array_add), when you could just write $results[$archive->year] = array($archive->month => array('name' => $archive->month_name));? Oh, and could it be that "January" isn't int $results because it's not in the $archives to begin with? check those values, too
• Christopher: @EliasVanOotegem with your code i get the same output but with January and not February.
• Elias Van Ootegem: @idknow: Because you'd need to check if $results[$archive->year] doesn't already exist, if it does, your code currently reassigns it (overwriting the array that it already holds), I'll post an answer

Answer 1

In response to my comments - here's what I'd do:

foreach ($archives as $archive)
{
 if (!isset($results[$archive->year]))
 {//if the year-key doesn't exist yet, create it
 //if it already exists, this part will be skipped
 $results[$archive->year] = array();
 }
 //then add the values
 $results[$archive->year][$archive->month] = array(
 'name' => $archive->month_name
 );
}

That's all there is to it, no need for a home-made function or anything like that

Answer 2

How about array_push($array, 'key', 'value');

• Elias Van Ootegem: That won't work at all, that'll push 'key' and 'value' as separate values onto $array consecutively see the manual