Merge arrays (PHP)

Question

How combine arrays in this way?

source:

Array
(
   [0] => Array
       (
           [id] => 3
           [title] => book
           [tval] =         


        

Answer 1

This should work:

$result = array();
foreach($array as $elem) {
    $key = $elem['id'];
    if (isset($result[$key])) {
        $result[$key]['tval'] .= ',' . $elem['tval'];
    } else {
        $result[$key] = $elem;
    }
}

This basically groups elements by id, concatenating tvals (separated by ,).