Restar dos Fechas en php


public static function restaFechas($dFecIni, $dFecFin)
{
    $dFecIni = str_replace("-","",$dFecIni);
    $dFecIni = str_replace("/","",$dFecIni);
    $dFecFin = str_replace("-","",$dFecFin);
    $dFecFin = str_replace("/","",$dFecFin);

    ereg( "([0-9]{1,2})([0-9]{1,2})([0-9]{2,4})", $dFecIni, $aFecIni);
    ereg( "([0-9]{1,2})([0-9]{1,2})([0-9]{2,4})", $dFecFin, $aFecFin);

    $date1 = mktime(0,0,0,$aFecIni[2], $aFecIni[1], $aFecIni[3]);
    $date2 = mktime(0,0,0,$aFecFin[2], $aFecFin[1], $aFecFin[3]);

    return round(($date2 - $date1) / (60 * 60 * 24));
}