Question

I’m newbie to PHP and CodeIgniter. So I have a database query result like this:

Result = array(

A = array(
        [a]=>'1',
        [b] =>'2',
     );

B = array(
        [a] =>'1',
        [b] =>'3',
     );

C = array(
        [a] =>'1',
        [b] =>'4',
     );

**and more...**

);

So how can I merge them into one array like this:

Result = array(

     Z = array(

        [a] =>'1',
        [b] => array(

               [0] =>'2',
               [1] =>'3',
               [2] =>'4',
        );

     );

Thanks you so much…

Answer 1

$A = array( 'a' => '1', 'b' => '2', 'c' => '3');
$B = array( 'a' => '1', 'b' => '3', 'd' => '4');
$C = array( 'a' => '1', 'b' => '4', 'c' => '5');

$Result = array($A, $B, $C);
$Z = array();
foreach ($Result as $set) {
    foreach ($set as $key => $val) {
        if (isset($Z[$key])) {
            if (is_array($Z[$key])) {
                $Z[$key][] = $val;
            } elseif ($Z[$key] != $val) {
                $Z[$key] = array($Z[$key], $val);
            }
        } else {
            $Z[$key] = $val;
        }
    }
}

print_r($Z);

OUTPUT

Array
(
    [a] => 1
    [b] => Array
        (
            [0] => 2
            [1] => 3
            [2] => 4
        )

    [c] => Array
        (
            [0] => 3
            [1] => 5
        )

    [d] => 4
)

If you want unique values per key, for instance if you want to avoid a equalling array(1, 1, 2), then you can do this:

$Z = array();
foreach ($Result as $set) {
    foreach ($set as $key => $val) {
        if (!isset($Z[$key])) {
            $Z[$key] = array();
        }
        $Z[$key][] = $val;
    }
}

foreach($Z as $k => $v) {
    $newv = array_unique($v);
    if (count($newv) == 1) {
        $Z[$k] = $newv[0];
    } else {
        $Z[$k] = $newv;
    }
}

print_r($Z);