从复杂数组创建简单数组

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)?

Answer 1

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!';  }