Create simple array from complex array

Question

I have the following two arrays:

Array One

Array ( [0] => WP_Term Object ( [term_id] => 36 [name] => Fractions [slug] => fractions-cat [term_group] => 0 [term_taxonomy_id] => 36 [taxonomy] => emp_unit_name [description] => [parent] => 0 [count] => 11 [filter] => raw [term_order] => 0 ) 
        [1] => WP_Term Object ( [term_id] => 38 [name] => Geometry [slug] => geometry [term_group] => 0 [term_taxonomy_id] => 38 [taxonomy] => emp_unit_name [description] => [parent] => 0 [count] => 2 [filter] => raw [term_order] => 0 ) 
      )

Array Two

Array ( [0] => WP_Term Object ( [term_id] => 36 [name] => Fractions [slug] => fractions-cat [term_group] => 0 [term_taxonomy_id] => 36 [taxonomy] => emp_unit_name [description] => [parent] => 0 [count] => 11 [filter] => raw [term_order] => 0 ) )

I'm trying to compare the two arrays to find if there are any matches for the [term_id] values as such:

$match = array_intersect($array_one_ids, $array_two_ids);
if( count($match) > 0) {  echo 'we have a match!';  }

My question is, how can I create arrays (defined by $array_one_ids and $array_two_ids) of just the term_id values in each of the above arrays such that $array_one_ids would = array(36, 38) and $array_two_ids would = array(36)?

I added an answer that I think will work for you. This looks like wordpress stuff, and there may be a neater way of doing it in wordpress, but that isn't my area of expertise so I can't advise there. But maybe if you show how you're getting these two arrays and add a wordpress tag, you could get a better answer based on that. — Don't Panic
– Don't Panic, Commented May 14, 2018 at 20:28

Don't Panic · Accepted Answer · 2018-05-14 20:33:35Z

2

You can use array_column on each of the input arrays to convert them to arrays of term_id.

$match = array_intersect(
    array_column($arrayOne, 'term_id'),
    array_column($arrayTwo, 'term_id')
);

For older PHP versions where array_column doesn't handle arrays of objects, you can use array_map to extract that property.

$match = array_intersect(
    array_map(function($term) { return $term->term_id; }, $arrayOne),
    array_map(function($term) { return $term->term_id; }, $arrayTwo)
);

Also, you don't have to count $match to check the result, as an array evaluates to true or false in an if condition depending on whether it's empty. (See "converting to boolean".)

if ($match) {  echo 'we have a match!';  }

edited May 14, 2018 at 20:33

answered May 14, 2018 at 20:25

Don't Panic

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4 Comments

scmccarthy22 Over a year ago

In your example, I'm getting an empty array with: print_r(array_column($user_terms, 'term_id'))

Don't Panic Over a year ago

Hmm, what's your PHP version? array_column won't work on arrays of objects in older versions (before 7)

Don't Panic Over a year ago

@scmccarthy22 I added a different method that should work if you're still on PHP 5.

scmccarthy22 Over a year ago

Thanks @Don't Panic - this worked well. Other Wordpress-specific answers worked as well, but checking this as the best answer since I tagged the question as just "php" ... Thanks again

Chin Leung · Accepted Answer · 2018-05-14 20:38:07Z

1

If you do not need the whole WP_Term object, you can add a fields parameter to your query when you retrieve it to only retrieve the ids of the terms.

For example:

$queryOne = new WP_Term_Query(array(
    'taxonomy' => 'emp_unit_name',
     ... // The other args of your query,
    'fields' => 'ids'
));

Then you can access the ids ($query->terms):

array(36, 38);

Once you have both queries, you could do:

$match = array_intersect($queryOne->terms, $queryTwo->terms);

However, if you need the whole object, you can do it like @Don't Panic's answer.

answered May 14, 2018 at 20:38

Chin Leung

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