PHP 验证 - 表单未验证

Question

我是 Java 人，开始 PHP。这是我在 PHP 上的第一个问题。

玩表格。我没有让它工作。表单只是不验证并静默提交。我的错误是什么？

错误信息没有打印出来。

<html>
    <head>
        <title></title>
        <link href="css/program-07.css" rel="stylesheet" type="text/css"/>
            <div id="requirements" style="margin: 0 auto; text-align:justify; width:850px;">
                <h1></h1>
        </head>
        <body>
            <nav class="sidenav">
                <header class="w3-container">
                <h3>Navigation</h3>
                </header>
                    <a href="http://lineofcode.com/itse2302-002/itse2302-002-007/">Home</a>     
                    <a href="index.php">Program07</a>
                    <a target="_blank" href="selfprocessor.php">Self Processor</a>
                    <a target="_blank" href="validatecontrols.php">Validate Controls</a>
            </nav>

            <div id="main" style="margin-left:25%">

            <?php
                echo "<h2>Requirement 01 - Datalists + Navigation</h2>";
                echo "<h3>To the left are navigation links to the files in this program, and below (not visible) datalists of the days of the week and months of the year that will be used in requirement 2.";            ?>


                    <datalist id="daysweek">
                        <option value="Monday">
                        <option value="Tuesday">
                        <option value="Wednesday">
                        <option value="Thursday">
                        <option value="Friday">
                        <option value="Saturday">
                        <option value="Sunday">
                    </datalist>

                    <datalist id="monthsyear">
                        <option value="January">
                        <option value="February">
                        <option value="March">
                        <option value="April">
                        <option value="May">
                        <option value="June">
                        <option value="July">
                        <option value="August">
                        <option value="September">
                        <option value="October">
                        <option value="November">
                        <option value="December">
                    </datalist>

            <?php           
                echo "<hr>";

                echo "<h2>Requirement 02 - Datalists</h2>";
                echo "<h3>The two datalists from above are now incorporated into a form that the user can see and interact with.</h3>";
                echo "Input a day of the week and a month of the year.";
            ?> 
                    <form action="daymonth.php" method="get">
                      <input list="daysweek" name="days">
                        <datalist id="day">
                          <option value="Monday">
                          <option value="Tuesday">
                          <option value="Wednesday">
                          <option value="Thursday">
                          <option value="Friday">
                          <option value="Saturday">
                          <option value="Sunday">
                        </datalist>

                        <input list="monthsyear" name="months">
                            <datalist id="month">
                                <option value="January">
                                <option value="February">
                                <option value="March">
                                <option value="April">
                                <option value="May">
                                <option value="June">
                                <option value="July">
                                <option value="August">
                                <option value="September">
                                <option value="October">
                                <option value="November">
                                <option value="December">
                              </datalist>
                        <input type="submit">
                    </form>

            <?php                 
                echo "<hr>";

                echo "<h2>Requirement 03 - Form Processor</h2>";
                echo "<h3>A form processor file named daymonth was created for the form data in requirement 2.  A function called test_input checks the data for safety.</h3>";

                echo "<hr>";

                echo "<h2>Requirement 04 - Favorites Form</h2>";
                echo "<h3>This form includes required fields.</h3>";

                $nameErr = $movieErr = $foodErr = $seasonErr = "";
                $name = $movie = $food = $season = $comment = "";

                if ($_SERVER["REQUEST_METHOD"] == "POST") {
                   if (empty($_POST["name"])) {
                     $nameErr = "Please tell us your name!";
                   } else {
                     $name = test_input($_POST["name"]);
                   }

                   if (empty($_POST["movie"])) {
                     $movieErr = "Please tell us your favorite movie!";
                   } else {
                     $email = test_input($_POST["movie"]);
                   }

                   if (empty($_POST["food"])) {
                     $foodErr = "Please tell us your favorite food!";
                   } else {
                     $website = test_input($_POST["food"]);
                   }

                    if (empty($_POST["season"])) {
                     $seasonErr = "Please tell us your favorite season!";
                   } else {
                     $gender = test_input($_POST["season"]);
                   }

                   if (empty($_POST["comment"])) {
                     $comment = "";
                   } else {
                     $comment = test_input($_POST["comment"]);
                   }
                }

            ?>
                <p><span class="error">* required field.</span></p>
                <form method="post" action="favorites.php"> 
                    Name: <input type="text" name="name">
                    <span class="error">* <?php echo $nameErr;?></span>
                    <br><br>
                    Favorite Movie: <input type="text" name="movie">
                    <span class="error">* <?php echo $movieErr;?></span>
                    <br><br>
                    Favorite Food: <input type="text" name="food">
                    <span class="error">* <?php echo $foodErr;?></span>
                    <br><br>
                    Favorite Season:
                    <input type="radio" name="season" value="Spring">Spring
                    <input type="radio" name="season" value="Summer">Summer
                    <input type="radio" name="season" value="Fall">Fall
                    <input type="radio" name="season" value="Winter">Winter
                    <span class="error">* <?php echo $seasonErr;?></span>
                    <br><br>
                    Comments:<br />
                    <textarea name="comment" rows="5" cols="40"></textarea>
                    <br><br>
                    <input type="submit" name="submit" value="Submit"> 
                </form>

               <?php     
                echo "<hr>";

                echo "<h2>Requirement 05 - </h2>";
                echo "<h3></h3>";


                echo "<hr>";

                echo "<h2>Requirement 06 - </h2>";
                echo "<h3></h3>";


                echo "<hr>";

                echo "<h2>Requirement 07 - </h2>";
                    echo "<h3></h3>";


                echo "<hr>";

                echo "<h2>Requirement 08 - </h2>";
                echo "<h3></h3>";

                echo "<hr>";

                echo "<h2>Requirement 09 - </h2>";
                echo "<h3></h3>";


                echo "<hr>";


            ?>
                </div>
            </div>
        </body>
</html>

还有我的favorites.php

<head>
    <title>Program 07 - Nicola Stewart</title>
    <link href="css/program-07.css" rel="stylesheet" type="text/css"/>
        <div id="daymonth" style="margin: 0 auto; text-align:justify; width:850px;">
</head>

<body>
    <nav class="sidenav" style="width:25%">
        <header class="w3-container">
        <h3>Navigation</h3>
        </header>
        <a href="http://lineofcode.com/itse2302-002/itse2302-002-007/">Home</a>     
        <a href="index.php">Program07</a>           
  </nav>

    <div id="main" style="margin-left:25%">

        <h2>Requirement 04 - Favorites Form</h2>

        <header class="container">
        <h1>Welcome!</h1>
        </header>
        <div class="container">

        <?php
            $name = $movie = $food = $season = $comment = "";

            if ($_SERVER["REQUEST_METHOD"] == "POST") {
                $name = test_input($_POST["name"]);
                $movie = test_input($_POST["movie"]);
                $food = test_input($_POST["food"]);
                $season = test_input($_POST["season"]);
                $comment = test_input($_POST["comment"]);

            }

            function test_input($data) {
               $data = trim($data);
               $data = stripslashes($data);
               $data = htmlspecialchars($data);
               return $data;
            }

            echo "<h2>You selected:</h2>";
            echo "<h3>";
            echo "<br>";
            echo $name;
            echo "<br>";
            echo $movie;
            echo "<br>";
            echo $food;
            echo "<br>";
            echo $season;
            echo "<br>";
            echo $comment;
            echo "</h3>";
        ?>

        </div>
    </div>

</body>

Answer 1

您正在将表单数据发布到 favorites.php

<form method="post" action="favorites.php"> ... </form>

改为：

<form method="post" action="index.php"> ... </form>

或者将您的表单验证移至 favorites.php

如果你想再次显示你的表单，我建议你将负责表单HTML的代码单独移动到一个文件中（即form.php），然后你可以执行以下操作在 index.php 和 favorites.php 中：

include 'form.php'

请注意，当您在另一个文件中包含 PHP 文件时，变量是共享的，这意味着您可以 use/override 变量。

（您也可以对网站的页眉和页脚进行包含）

编辑（回复评论） 更新test_data()：

function test_input($index) {
  if (isset($_POST[$index])) {  // make sure that the index exists in $_POST
    $data = $_POST[$index];
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
  }
  return null;  // or any default value
}

你可以这样使用它：

$season = test_input("season");

个人最喜欢从 POST 或 GET 获取数据：

filter_input()

$season = filter_input(INPUT_POST, 'season', FILTER_SANITIZE_SPECIAL_CHARS);

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