流程控制主要为以下几种,代码已总结
(1)if语句
(2)for循环
(3)while循环
(4)switch分支语句
(5)while.. do..while循环
<?php
//流程控制
//if语句
$b = true;
$b2 = false;
if($b){
echo "真";
}
if(!$b2){
echo "假";
}
//等级判断
/*$score = 80;
if($score>=90){
echo "优秀";
}elseif ($score>=80){
echo"良好";
}elseif($score>=70){
echo"中等";
}elseif($score>=60){
echo"中等偏下";
}else{
echo"差";
}*/
//switch语句
/*$score = "A";
switch ($score){
case "A":
echo "优秀";
break;
case "B":
echo "中等";
break;
case "C":
echo "良好";
break;
case "D":
echo "中等偏下";
break;
default:
echo "差";
break;
}*/
//while循环
/*$i = 1;
$sum = 0;
while ($i<=100){
$sum += $i;
$i++;
}
echo "1-100之和:".$sun;*/
//do while
/*$sum = 0;
do{
$sum +=$i;
$i++;
}while($i<=100)
echo"
*/
//for循环
$sum = 0;
for($i=1;$i<=10;$i++) {
$sum +=$i;
}
echo "1-10之和:".$sum;
?>
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