How to array only one key from another array

Question

I'm editing the category.php template and I need an array of current category child's.

I'm able to get an array with current category child's but there are too many keys, I'm using the following:

//get category ID                
$catego = get_category( get_query_var( 'cat' ) );
$cat_id = $catego->cat_ID;

//list current category childs
$catlist = get_categories(
            array(
            'child_of' => $cat_id,
            'orderby' => 'id',
            'order' => 'ASC'
) );

That gives me the following:

Array
(
    [0] => WP_Term Object
        (
            [term_id] => 11
            [name] => test1
            [slug] => test1
            [term_group] => 0
            [term_taxonomy_id] => 11
            [taxonomy] => category
            [description] => 
            [parent] => 10
            [count] => 3
            [filter] => raw
            [cat_ID] => 11
            [category_count] => 3
            [category_description] => 
            [cat_name] => test1
            [category_nicename] => test1
            [category_parent] => 10
        )

    [1] => WP_Term Object
        (
            [term_id] => 12
            [name] => test2
            [slug] => test2
            [term_group] => 0
            [term_taxonomy_id] => 12
            [taxonomy] => category
            [description] => 
            [parent] => 10
            [count] => 1
            [filter] => raw
            [cat_ID] => 12
            [category_count] => 1
            [category_description] => 
            [cat_name] => test2
            [category_nicename] => test2
            [category_parent] => 10
        )

)

Now from this array I want to create an array which will only have the [cat_ID] key. I've tried the following but it gives me nothing ( http://php.net/manual/en/function.array-column.php ):

$category_id = array_column($catlist, '[cat_ID]');
print_r($category_id);

Any ideas? Thanks in advance.

Sumesh S · Accepted Answer · 2017-06-21 13:59:16Z

1

Try this :

// This converts the WP_Term Object to array.
$catlist = json_decode(json_encode($catlist),true);

$category_id = array_column($catlist, 'cat_ID');
print_r($category_id);

edited Jun 21, 2017 at 13:59

answered Jun 21, 2017 at 13:52

Sumesh S

2011 silver badge7 bronze badges

@Mike You're welcome .. :)

Sumesh S
– Sumesh S

2017-06-21 14:02:11 +00:00
Commented Jun 21, 2017 at 14:02

Add a comment |

sebastian_aps · Accepted Answer · 2017-06-21 14:32:08Z

1

You can always use array_map()

$category_id = array();
$category_id = array_map( function ($data){
            return $data['cat_ID'];
        }, $catlist);

Or wordpress function:

   $category_id = array();
   $category_id =  wp_list_pluck( $catlist, 'cat_ID' );

answered Jun 21, 2017 at 14:32

sebastian_aps

1415 bronze badges

Add a comment |

Senta · Accepted Answer · 2017-06-21 14:06:46Z

0

A foreach loop works:

$category_id = array();
foreach ($catlist as $cat){
    $category_id[] = $cat->cat_ID;
}

edited Jun 21, 2017 at 14:06

answered Jun 21, 2017 at 13:46

Senta

313 bronze badges

Nope, still nothing:(

Mike
– Mike

2017-06-21 13:49:50 +00:00
Commented Jun 21, 2017 at 13:49
How about the foreach @Mike

Senta
– Senta

2017-06-21 13:52:54 +00:00
Commented Jun 21, 2017 at 13:52

Add a comment |

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