PHP array convert ids to count

Question

I am pulling out a list of popular product IDs into an array that looks like this

Array
(
    [0] => stdClass Object
        (
            [popular_product] => 2,60
        )

    [1] => stdClass Object
        (
            [popular_product] => 12,61,60
        )

    [2] => stdClass Object
        (
            [popular_product] => 2
        )

    [3] => stdClass Object
        (
            [popular_product] => 9
        )

    [4] => stdClass Object
        (
            [popular_product] => 14
        )

)

I want to create a new array that shows me what the most popular products are by count, my approach is this

Combine all popular_product ids into one long comma seperated string like this

2,60,12,61,60,2,9,14

Is this the most efficient approach?

Comma seperated strings isn't really a good practice, why don't you just split the id's up? So you get something like ['object'] -> [key] -> [productId] — Patrick
– Patrick, Commented Mar 28, 2018 at 9:29

u_mulder · Accepted Answer · 2018-03-28 09:39:17Z

2

Since php7 you can pass array of objects to array_column, so it will be something like:

print_r(implode(',', array_column($a, 'popular_product')));

For php5 you need to use a foreach or some array_ methods, for example:

print_r(implode(',', array_reduce($a, function($t,$v) { $t[] = $v->popular_product; return $t; }, [])));

answered Mar 28, 2018 at 9:39

u_mulder

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