PHP循环结构实例讲解
这篇文章主要介绍了PHP循环结构实例讲解,需要的朋友可以参考下
for循环语句
完整的金字塔
复制代码 代码如下:
//打印金字塔
$n=25;
for($i=1;$i //空格循环
for($k=1;$k echo ' ';
}
//字符循环
for($j=1;$j
if($i==1 || $i==$n){
echo '.';
}
else{
if($j==1 || $j==$i*2-1){
echo '.';
}else{
echo ' ';
}
}
}
/*
for($j=1;$j echo '.';
}*/
echo '
';
}
switch语句:
复制代码 代码如下:
/*$a="1";
switch ($a) {
case 1:
echo $a;
break;
default:
echo "错误";
break;
}
//自动转换字符串和数字
switch选择语句中遇到布尔值时的处理:
复制代码 代码如下:
$b=true;
switch($b){
case false:
echo "不匹配";
break;
//代表非false的值都可以为true-----自动转换类型
case "1":
echo "成功匹配";
break;
default:
echo "ko";
}
//1.default语句不论顺序都是最后执行,,如果没有匹配到其他的case,那么就执行default语句
//2.如果没有break语句,那么就会输出下一个case的结果,直到有break为止。
while循环和do..while循环:
复制代码 代码如下:
/*while循环
$i=0;
while($i echo "paxster
".$i;
$i++;
}
//do..while循环--------先执行再判断,至少执行一次
/*$do=0;
do{
echo '
Paxster';
$do=$do+1;
}while($do
while循环和switch选择语句的结合:
常量:
复制代码 代码如下:
//定义常量-----两种方法
define('TAX',200);
echo TAX;
const Tab=100;
echo Tab;
编写简易计算器:
step1:编写输入界面
复制代码 代码如下:

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