Question

Programming Language I am using : PHP

I have 30 results from database, which can be ARRAY or OBJECTs

What I want is an algorithm to find COMMON values.

Ex :

$data[0] = array('effected_object_id'=>54,'data'=>array('some_data'));
$data[1] = array('effected_object_id'=>21,'data'=>array('some_data'));
$data[2] = array('effected_object_id'=>63,'data'=>array('some_data'));
$data[3] = array('effected_object_id'=>21,'data'=>array('some_data'));
$data[4] = array('effected_object_id'=>54,'data'=>array('some_data'));
$data[5] = array('effected_object_id'=>21,'data'=>array('some_data'));
...... 30 arrays

in above example, in effect_object_id column I have few common elements, like 21(3), 54(2)

I want to get these common elements.

Sorry if this is already asked and solved somewhere, I just googled and tried my head on it. but can’t find a FAST SOLUTION, yes I don’t need too much of loops here.

Thanks in advance. 🙂

Answer 1

$groups = array();
foreach ($data as $row) {
    $groups[ $row['effected_object_id'] ][] = $row;
}