几个php源码简单实操案例分享
几个php源码简单实操案例分享例题一、判断闰年(练习双分支)
<body>
<?php
if(!empty($_POST)){ //$_POST不为空说明有post提交的数据
//var_dump($_POST);
$year=$_POST['year']; //获取年份
if($year==''){
echo '您没有输入年份';
}else{
if(is_numeric($year)){ //判断$year是否是数字或字符串数字
$year+=0; //将字符串数字转成数字型
if(is_int($year)){ //is_int用来检测变量是否是整型
if($year<1){
echo '年份必须正整数';
}else{
if($year%4==0 && $year%100!=0 || $year%400==0)
echo "{$year}是闰年";
else
echo "{$year}是平年";
}
}else{
echo '您输入的不是整数';
}
}else{
echo '您输入的不是数字';
}
}
}
?>
<form method="post" action="">
请输入年份: <input type="text" name="year"> <br />
<input type="submit" name="button" value="判断闰年">
</form>
</body>例题二:判断成绩(练习多分支)
<body>
<?php
if(isset($_POST['button'])){ //点击了提交按钮
$ch=$_POST['ch']; //获取语文成绩
$math=$_POST['math']; //获取数学成绩
if($ch=='' || !is_numeric($ch) || $ch<0 || $ch>100){
echo '语文成绩必须在0-100之间';
}
elseif($math=='' || !is_numeric($math) || !($math>=0 && $math<=100)){
echo '数学成绩必须在0-100之间';
}else{
$avg=($ch+$math)/2; //求平均值
echo "您的平均分是:{$avg}<br>";
if($avg>=90)
echo 'A';
elseif($avg>=80)
echo 'B';
elseif($avg>=70)
echo 'C';
elseif($avg>=60)
echo 'D';
else
echo 'E';
}
}
?>
<form method="post" action="">
语文: <input type="text" name="ch"> <br />
数学: <input type="text" name="math"> <br />
<input type="submit" name="button" value="判断成绩">
</form>
</body>**例题三:更改颜色(switch-case)**
<body>
<?php
if(isset($_POST['button'])) {
switch($_POST['color']){
case '1':
$color='#FF0000'; //红色
break;
case '2':
$color='#009900'; // 绿色
break;
case '3':
$color='#0000FF'; //蓝色
break;
default:
$color='#000000'; //黑色
}
echo <<<str
<script type="text/javascript">
window.onload=function(){
document.getElementById('shi').style.color='$color';
}
</script>
str;
}
?>
<div id="shi">
锄禾日当午, <br />
汗滴禾下土。 <br />
谁知盘中餐, <br />
粒粒皆辛苦。 <br />
</div>
<form method="post" action="">
<select name="color">
<option value="0">请选择颜色</option>
<option value="1">红色</option>
<option value="2">绿色</option>
<option value="3">蓝色</option>
</select>
<input type="submit" name="button" value="更改颜色">
</form>
</body>例题四:计算器加减乘除算法
<body>
<?php
$num1=''; //$num1的初始值
$num2=''; //$num2的初始值
$op=''; //操作符
$result=''; //结果
if(!empty($_POST)) {
$num1=$_POST['num1'];
$num2=$_POST['num2'];
$op=$_POST['op']; //操作符
switch($op){
case '+':
$result=$num1+$num2;
break;
case '-':
$result=$num1-$num2;
break;
case '*':
$result=$num1*$num2;
break;
case '/':
$result=$num1/$num2;
break;
}
}
?>
<form method="post" action="">
<input type="text" name="num1" value='<?php echo $num1?>'>
<select name="op">
<option value="+" <?php echo $op=='+'?'selected':''?>>+</option>
<option value="-" <?php echo $op=='-'?'selected':''?>>-</option>
<option value="*" <?php echo $op=='*'?'selected':''?>>*</option>
<option value="/" <?php echo $op=='/'?'selected':''?>>/</option>
</select>
<input type="text" name="num2" value='<?php echo $num2?>'>
<input type="submit" name="button" value="=">
<input type="text" name="result" value='<?php echo $result?>'>
</form>
</body>
页:
[1]