<body> <?php $str=''; if(isset($_GET['1name'])) { $name = $_GET['1name']; if (empty($name)) { return $str = "姓名不能为空!"; if (is_numeric($name)) { return $str = "姓名不能为数字"; if (isset($_GET['lscore'])) { $score = $_GET['lscore']; if (empty($score)) { return $str = "成绩不能为空"; if (is_numeric($score)) { if ($score < 0 || $score > 100) { return $str = "成绩虚假,son of a bitch"; } else { switch ((integer)($score / 10))//0,1,2,3,...,10 { case 10: $str = 'A+'; break; case 9: $str = 'A'; break; case 8: $str = 'B'; break; case 7: $str = 'C'; break; case 6: $str = 'D'; break; default: $str = 'fail'; break; } } } } } } } } ?> <form action="#" method="get"> 请输入学生的姓名: <input type="text" name="1name" value="<?php if(!empty($_POST["lname"])){ echo $_GET["lname"] ;} ?>" /><br /> 请输入学生的成绩: <input type="text" name="1score" value="<?php if(!empty($_POST["lscore"])){echo $_GET["lscore"];} ?>" /><br /> <input type="submit" value="提交" /> </form> <?php echo $str; ?> </body> </html>
http://www.imooc.com/wenda/detail/333114原问题连锁
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