Chunk array by value

Question

how do you chunk array like this below?

array(
[0] => array(
    ['id'] => '1',
    ['parent_id'] => ''
)
[1] => array(
    ['id'] => '2',
    ['parent_id'] => ''
)
[2] => array(
    ['id'] => '3',
    ['parent_id'] => '1'
)
[3] => array(
    ['id'] => '3',
    ['parent_id'] => '1'
)
[4] => array(
    ['id'] => '3',
    ['parent_id'] => '2'
)
)

I'd like to group subelements (with specified parent_id) to do a separate foreach.

you have reconstruct your array by placing the sub elements under a tree of a parent_id it self — DevZer0
– DevZer0, Commented Jul 17, 2013 at 8:56
one option is to walk through the array with foreach and create a new array manually depending on the current sub-array values. — steven
– steven, Commented Jul 17, 2013 at 8:57

JimL · Accepted Answer · 2013-07-17 09:01:09Z

4

You can do a simple foreach and rearrange the array.

$result = array();
foreach ($arr as $element) {
  $result[$element['parent_id']][] = $element;
}

http://phpfiddle.org/main/code/3ar-ixg

answered Jul 17, 2013 at 9:01

JimL

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