php - Modify an array -

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i've got array generated mysql query database it's : 

array (     [0] => array         (             [0] => array                 (                     [id_device] => 1                     [device_name] => iphone 5                     [device_brand] => apple                 )              [1] => array                 (                     [id_device] => 2                     [device_name] => iphone 4/4s                     [device_brand] => apple                 )          )      [1] => array         (             [0] => array                 (                     [id_device] => 3                     [device_name] => galaxy s4                     [device_brand] => samsung                 )              [1] => array                 (                     [id_device] => 4                     [device_name] => galaxy s3                     [device_brand] => samsung                 )          )  )

i'd like : 

array (     [apple] => array         (             [0] => array                 (                     [id_device] => 1                     [device_name] => iphone 5                 )              [1] => array                 (                     [id_device] => 2                     [device_name] => iphone 4/4s                 )          )      [samsung] => array         (             [0] => array                 (                     [id_device] => 3                     [device_name] => galaxy s4                 )              [1] => array                 (                     [id_device] => 4                     [device_name] => galaxy s3                 )          )  )

i don't understand logic in array (i'm pretty sure it's because i'm stressed , busy though). can me ?

another solution change mysql query maybe, i'm obtaining array php class in use 2 methods : 

public static function getdevicesbrands() {     $sql = 'select distinct '._db_prefix_.'device.device_brand     '._db_prefix_.'device';     $rq = db::getinstance(_ps_use_sql_slave_)->executes($sql);     return ($rq); }  public static function getdevicesbybrand($brand) {     $sql = 'select id_device, device_name, device_brand      '._db_prefix_.'device     '._db_prefix_.'device.device_brand = "'.$brand.'"';     $rq = db::getinstance(_ps_use_sql_slave_)->executes($sql);     return ($rq); }

in controller shown array using piece of code : 

$device_brand = device::getdevicesbrands(); $row = count($device_brand); $devices_by_brand = array();  ($i = 0; $i <= $row - 1; $i++) {     array_push($devices_by_brand, device::getdevicesbybrand($device_brand[$i]['device_brand'])); }  echo"<pre>"; print_r($devices_by_brand); echo"</pre>";

changing for-loop in controller should trick:

for ($i = 0; $i <= $row - 1; $i++) {     $brand = $device_brand[$i]['device_brand'];     $devices_by_brand[$brand] = device::getdevicesbybrand($brand); }

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