本文实例为大家分享了PHP实现计算器小功能的具体代码，供大家参考，具体内容如下<php if (isset($_POST['sub'])) { $f = true; $error = "有以上问题: <br>"; if
本文实例为大家分享了PHP实现计算器小功能的具体代码，供大家参考，具体内容如下
<?php if (isset($_POST['sub'])) { $f = true; $error = "有以上问题: <br>"; if ($_POST["num1"] == "") { $f = false; $error .= "第一个数不能为空.<br>"; } else { if(!is_numeric($_POST[num1])) { $f = false; $error .= "第一个数字不是数字.<br>"; } } if ($_POST['num2'] == "") { $f = false; $error .= "第二个数字不能为空.<br>"; } else { if (!is_numeric($_POST['num2'])) { $f = false; $error .= "第二个数字不是数字<br>"; } } if ($f) { switch ($_POST['ysf']) { case '+': $sum = $_POST['num1']+$_POST['num2']; break; case '-': $sum = $_POST['num1']-$_POST['num2']; break; case '*': $sum = $_POST['num1']*$_POST['num2']; break; case '/': $sum = $_POST['num1']/$_POST['num2']; break; case '%': $sum = $_POST['num1']%$_POST['num2']; break; } } }?><!doctype html><html><head><meta charset="utf-8"><title>简易计算器</title><style> * { margin: 0px; padding: 0px; } #contains { width: 400px; margin: 50px auto; } h1 { width: 400px; text-align: center; color: #0F0; } table { margin-top: 20px; width: 400px; } input { background: yellow; border-radius: 20px; } input:hover { background: green; } select { background: yellow; border-radius: 20px; } td { background: #3F0; text-align: center; height: 30px; } #sub { border-radius: 25px; width: 50px; }</style></head> <body> <div id="contains"> <h1>简易计算器</h1> <form action="Calculator.php" method="post"> <table border="0"> <tr> <td><input type="text" name="num1" value="<?php echo $_POST['num1'];?>" size="3"/></td> <td> <select name="ysf"> <option <?php if($_POST['ysf'] == "+") echo "selected";?> value="+">+</option> <option <?php if($_POST['ysf'] == "-") echo "selected";?> value="-">-</option> <option <?php if($_POST['ysf'] == "*") echo "selected";?> value="*">*</option> <option <?php if($_POST['ysf'] == "/") echo "selected";?> value="/">/</option> <option <?php if($_POST['ysf'] == "%") echo "selected";?> value="%">%</option> </select> </td> <td><input type="text" name="num2" value="<?php echo $_POST['num2'];?>" size="3"/></td> <td><input type="submit" id = 'sub' name="sub" value="计算"/></td> </tr> <tr> <td colspan="4"> <?php if ($f) { echo "计算结果: <b>{$_POST['num1']}{$_POST['ysf']}{$_POST['num2']} = {$sum}</b>"; } else { echo "<b>$error</b>"; } ?> </td> </tr> </table> </form> </div></body></html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程圈。
