<?
$sex = "boy";

if($sex == "boy"){
    echo "我是帥哥";
}


if($sex == "girl"){
    echo "我是美女";
}
?>

<?
$year = 35;

if($year >= 40){
    echo "我有豐富的學識";
}else{
    echo "我有很好的學習力";
}
?>

<?
$year = 26;

if($year >= 40){
    echo "我有豐富的學識";
}elseif($year >= 20 and $year < 40){
    echo "我有很好的學習力";
}else{
    echo "我還有好多要學喔";
}
?>