from group add multidimensional array code example
Example: php group multidimensional array by value
function arraySort($input,$sortkey){
foreach ($input as $key=>$val) $output[$val[$sortkey]][]=$val;
return $output;
}
function arraySort($input,$sortkey){
foreach ($input as $key=>$val) $output[$val[$sortkey]][]=$val;
return $output;
}