ช่วยด้วยครับ....การรวมค่าอาเรย์ที่มีหัวคีย์เหมือนกัน

$buff  = array();
foreach( $youarray as $data){
     if( isset($buff[$data['CRZONE_CODE']])){
         $buff[$data['CRZONE_CODE']]['TOTAL'] += $data['TOTAL'];
     }else{
         $buff[$data['CRZONE_CODE']] = $data;
     }
}
print_r($buff);

if($buff[$data['CRZONE_CODE']]['datetime']< $data['datetime']){
     $buff[$data['CRZONE_CODE']]['datetime'] = $data['datetime'];
};

if( isset($buff[$data['CRZONE_CODE'].$data['datetime']])){
        $buff[$data['CRZONE_CODE'].$data['datetime']]['TOTAL'] += $data['TOTAL'];
}else{
        $buff[$data['CRZONE_CODE'].$data['datetime']] = $data;
}

foreach($buff as $SHOW){
        echo $SHOW['datetime'];
        echo $SHOW['CRZONE_NAME'];
        echo $SHOW['TOTAL'];
        echo '<br>';
}