练习使用定界符和写一个计算器 -

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使用定界符

<?php
$color1="red";
var_dump($color1);
echo <<<EOF
<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>九宫格</title>
  </head>
  <style type="text/css">
    .boxfather {
      display: flex;
      flex-wrap: wrap;
      width: 150px;
    }
    .box {
      width: 50px;
      height: 50px;
      box-sizing: border-box;
      border: 1px solid black;
    }
  </style>
  <body>
    <body>
      <div class="boxfather">
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
        <div class="box" style="background-color:{$color1}"></div>
      </div>
    </body>
  </body>
</html>
EOF;
?>

计算器

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>计算器</title>
  </head>
  <body>
  <?php
  error_reporting(E_ALL & ~E_NOTICE);
  if(isset($_POST['sub']))
  {
   if($_POST['opt'] == '/' && $_POST['num2'] == 0 || $_POST['opt'] == '%' && $_POST['num2'] == 0) $mess = "<span style='color:red;'>oops~除数不能为0</span>";
  }
?>
    <table border="1">
        <form action="" method="POST">
      <tr>
        <th colspan="3">计算器</th>
      </tr>
      <tr>
        <td><input type="number" name="num1" required></td>
        <td>
            <select name="opt">
              <option value="+">+</option>
              <option value="-">-</option>
              <option value="*">*</option>
              <option value="/">/</option>
            </select>
            </td>
          <td><input type="number" name="num2" required></td>
      </tr>
      <tr>
          <td colspan="3" align="center">
          <input type="submit" name="sub" value="计算">
          </td>
      </tr>
    </form>
    </table>
    <?php
        if(!$mess):
            switch($_POST['opt']):
                case "+":
                    $sum = (int)$_POST['num1'] + (int)$_POST['num2'];break;
                case "-":
                    $sum = (int)$_POST['num1'] - (int)$_POST['num2'];break;
                case "*":
                    $sum = (int)$_POST['num1'] * (int)$_POST['num2'];break;
                case "/":
                    $sum = (int)$_POST['num1'] / (int)$_POST['num2'];break;
                case "%":
                    $sum = (int)$_POST['num1'] % (int)$_POST['num2'];break;
            endswitch;
            $res = "计算结果:{$_POST['num1']} {$_POST['opt']} {$_POST['num2']} = {$sum}";
            echo "<span style='color:green;'>{$res}</span>";
        else:
            echo $mess;
        endif;
               ?>
  </body>
</html>

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