PHP: Counting values in an array of objects

Question

I have a databse class which returns an array of objects. I am trying to get multiple bits of data from this single query, in order to prevent having to run three queries.

I have stumbled upon array_count_values() [ https://www.php.net/manual/en/function.array-count-values.php ] which will be perfect for catching various bits of data about the result set which I can use. Although I can't figure out how to cast all the second dimensions into arrays without having to just foreach through the whole return which would be a little bad I think.

Does anyone have any ideas how I can convert my array of objects, as a whole into an array, to allow this game changing function to do it's magic?

Array
(
    [0] => stdClass Object
        (
            [message_id] => 23185
            [from_profile] => 3165
            [to_profile] => 962
            [parent_message_id] => 17111
            [date_sent] => 2011-02-23 05:48:25
            [subject] => RE: hi
        )
// etc

There is also the issue that I've just thought of whilst typing this question, sods law eh? That will the function be able to parse multiple dimensions?

What property from the objects are your counting? Or are you not counting values from the objects? — Bailey Parker
– Bailey Parker, Commented Mar 1, 2011 at 12:11
I'm not sure, but do you mean something like array_walk_recusrive? — Zirak
– Zirak, Commented Mar 1, 2011 at 12:14

xzyfer · Accepted Answer · 2011-03-01 12:25:35Z

1

Since you only want to alter the first dimension, you can use array_walk

$dbResultsArray = // db results here

array_walk($dbResultsArray, function(&$elem) { $elem = (array)$elem; });

$dbResultsArray is passed by reference so once array_walk has run your $dbResultsArray is already updated.

I'm using closures which require php 5.3+ but you can use create_function in older versions.

answered Mar 1, 2011 at 12:25

xzyfer

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1 Comment

David Yell Over a year ago

Yep, this seems to be okay, as it will allow me to convert all the elements. Although not perfect as it's still looping.

Community · Accepted Answer · 2023-11-17 20:29:45Z

1

I am not much clear what you are talking about but there is a function which can count array elements as well as object properties.

count()

Hence you do not need to convert object into array for this purpose.

edited Nov 17, 2023 at 20:29

CommunityBot

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answered Mar 1, 2011 at 12:16

Daric

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1 Comment

David Yell Over a year ago

I don't want to count the array, but what's in the array.

Mantas Giniūnas · Accepted Answer · 2019-03-20 21:22:44Z

1

You could probably try something like

$result = array_count_values(array_map(function ($message) { return $message->id; }, $messageArray));

answered Mar 20, 2019 at 21:22

Mantas Giniūnas

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Comments

Desi · Accepted Answer · 2011-03-01 12:15:22Z

0

This might be able to point you in the right direction;

http://www.richardcastera.com/blog/php-convert-array-to-object-with-stdclass

As far as muliple dimensions go, I'm not sure on that one. Hopefully the above is helpful though.

answered Mar 1, 2011 at 12:15

Desi

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DhruvPathak · Accepted Answer · 2011-03-01 12:19:31Z

0

do a for loop on your array of objects, and typecast them as (array) and assign them back, you won't need to go inside further nesting,it will only typecase topmost level.

eg;

$newArr = array();
foreach($myObjArr as $t){
  $arr = (array)$t;
  $newArr[] = $arr;
}

edited Mar 1, 2011 at 12:19

answered Mar 1, 2011 at 12:13

DhruvPathak

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1 Comment

David Yell Over a year ago

A good suggestion, but I'd rather not foreach a loop which could be about 300 odd results.

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