if("06:00"< date("H:i") && date("H:i")<"12:00"){
echo"günaydın.jpg";
}elseif("12:00"<date("H:i")&& date("H:i")<"18:00"){
echo"tünaydın.jpg";
}elseif("18:00"<date("H:i")&& date("H:i")<"24:00"){
echo"iyi akşamlar.jpg";
}else{
echo "nedesem bilmem ki";
}
@firavun dan alıntı