Answer by chuyen nha for Round DOWN to nearest half integer in PHP

From my job's requirements. I put an function to do this. Hope you can view it as a reference:

function round_half_five($no) {    $no = strval($no);    $no = explode('.', $no);    $decimal = floatval('0.'.substr($no[1],0,2)); // cut only 2 number    if($decimal > 0) {        if($decimal <= 0.5) {            return floatval($no[0]) + 0.5;        } elseif($decimal > 0.5 && $decimal <= 0.99) {            return floatval($no[0]) + 1;        }    } else {        return floatval($no);    }}