PHP SUM object values

Question

When I try print_r( $category->child() )I got this: (pastebin: https://pastebin.com/hSnfMpLH)

How can I sum all topics? I've tried: array_sum( $category->child()['topics'] ) etc, but It not works. Sorry for my bad english

P.S found on stackoverflow:

Or as suggested by @MarkBaker:

$sum = array_sum((array)$myobj);

But how can I select 'topics' ?

var_dump https://pastebin.com/EqJ5TPuA

New code:

public function countingTotalTopics()
{
    foreach( $this->children() as $child )
    {
        $return = $child->topics;
    }
    
    return $return;
}

And when I try $category->countingTotalTopics() it gives me topics only from first child, how can I get it from another? I think I should call $child->countingTotalTopics() again in foreach, but how?

And if you can, put <pre> around it before you print/dump, this is kind of messy to read. — Qirel
– Qirel, Commented Mar 29, 2017 at 11:17
Try using: echo "<pre>".print_r( $category->child(),true )."</pre>". It may offer a better view of the structure. — Sloan Thrasher
– Sloan Thrasher, Commented Mar 29, 2017 at 11:22
Your variable is of a certain class. You should use the methods available in that class to get information. Do you have the definition of the class, or are you using a library for this topic management? If so, which? — trincot
– trincot, Commented Mar 29, 2017 at 11:26

trincot · Accepted Answer · 2017-03-29 15:12:27Z

1

You are currently getting only the last child's topics. Use this array_merge-based function instead:

public function countingTotalTopics() {
    $return = [];
    foreach( $this->children() as $child ) {
        $return = array_merge($return, (array) $child->topics);
    }
    return $return;
}

edited Mar 29, 2017 at 15:12

answered Mar 29, 2017 at 11:51

trincot

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2 Comments

Evaldas Over a year ago

I've changed from $return = $child->topics to $return = $return + $child->topics and now everything works fine, is it good solution?

trincot Over a year ago

There is a small difference between + and array_merge: if the topics arrays have numerical, sequential keys, then + will not produce the desired result, but in all other cases it behaves the same way as array_merge. Maybe for array_merge to work in your case you need to cast it explicitly to array. See update. But if + works fine, then go with it.

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