<?php header("content-type:text/html;charset=utf-8"); session_start(); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" dir="ltr"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>簡單計算機</title> </head> <body> <form action="jisuan.php" method="post"> 第一個數<input type="text" value="" name="num1"><br /> 計算符號<select name="oper"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select><br /> 第二個數<input type="text" value="" name="num2"><br /> <input type="submit" value="計算結果"><br /> </form> </body> </html> <?php $num1 = $_POST['num1']; $num2 = $_POST['num2']; $oper = $_POST['oper']; $rs = 0; switch ($oper) { case "+": $rs = $num1 + $num2; break; case "-": $rs = $num1 - $num2; break; case "*": $rs = $num1 * $num2; break; case "/": $rs = $num1 / $num2; break; default: echo "您輸入的不正確"; } $_SESSION['rs'] = $rs; echo '計算結果爲:' . $_SESSION['rs']; ?>