PHP学习笔记2-流程控制

条件控制：if

<?php
function getLevel($score){
    if($score>=90){
        return "优秀";
    }elseif($score>=80){
        return "良好";
    }elseif($score>=70){
        return "中等";
    }elseif($score>=60){
        return "及格";
    }else{
        return "差";
    }
}
echo getLevel(90);

 

多分支控制：switch

<?php
function getLevel($score){
    switch(intval($score/10)){ //intval()把变量转换成整数类型
        case 10:
        case 9:
            return "优秀";
        case 8:
            return "良好";
        case 7:
            return "中等";
        case 6:
            return "及格";
        default:
            return "差";
    }
}
echo getLevel(90);

Break（终止语句执行）

<?php
function getLevel($score){
    $result = "差";
    switch($score/10) {
        case 10:
        case 9:
            $result = "优秀";
            break;
        case 8:
            $result = "良好";
            break;
        case 7:
            $result = "中等";
            break;
        case 6:
            $result = "及格";
            break;
        default:
            return "差";
    }
    return $result;
}
echo getLevel(90);