function rotate($a){
$b=array();
foreach($a as $val){
foreach($val as $k=>$v){
$b[$k][] = $v;
}
}
return $b;
} function rotate($a){
$b=array();
foreach($a as $val){
foreach($val as $k=>$v){
$b[$k][] = $v;
}
}
return $b;
} 