使用PHP合并子数组

Question

I have this array in PHP.

$all = array(
array(
    'titulo' => 'Nome 1',
    'itens' => array( 'item1', 'item2', 'item3')
),
array(
    'titulo' => 'Nome 2',
    'itens' => array( 'item4', 'item5', 'item6')
),
array(
    'titulo' => 'Nome 4',
    'itens' => array( 'item7', 'item8', 'item9')
));

How i can get this result above?

$filteredArray = array( 'item1', 'item2', 'item3', 'item4', 'item5', 'item6', 'item7', 'item8', 'item9');

I can do this with foreach, but have any other method more clean?

Answer 1

You can reduce the itens column of your array, using array_merge as the callback.

$filteredArray = array_reduce(array_column($all, 'itens'), 'array_merge', []);

Or even better, eliminate the array_reduce by using the "splat" operator to unpack the column directly into array_merge.

$result = array_merge(...array_column($all, 'itens'));