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问题描述

我正在制作一个测验/madlibs 类的网站,所以除了验证之外一切正常。每当用户输入特殊字符或将输入字段留空时,都应该有一个警告,并且不应允许提交按钮显示最终结果。

现在当我输入例如“?” 然后按下提交按钮,它将显示所有答案的最终结果。

我的验证做错了什么?我怎样才能做到这一点,这样你就不能把它留空并使用特殊字符。

我使用以下代码检查验证:

<?php
    $Input1 = $Input2 = $Input3 = $Input4 = $Input5 = $Input6 = $Input7 = "";
    $Input1Err = $Input2Err = $Input3Err = $Input4Err = $Input5Err = $Input6Err = $Input7Err = "";
    
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
      if(empty($_POST["Input1"])){
        $Input1Err = "enter something.";
      }else{
        $Input1 = test_input($_POST["Input1"]);
        if(!preg_match("/[^a-z0-9 _]+$/i", $Input1)){
          $Input1Err = "only letters and white space allowed";
        }
      }
    
    
    function test_input($data) {
      $data = trim($data);
      $data = stripslashes($data);
      $data = htmlspecialchars($data);
      return $data;
    } ?>

对于每个输入,我都进行了这样的验证:

      if(empty($_POST["Input1"])){
        $Input1Err = "enter something.";
      }else{
        $Input1 = test_input($_POST["Input1"]);
        if(!preg_match("/[^a-z0-9 _]+$/i", $Input1)){
          $Input1Err = "only letters and white space allowed";
        }
      }

这是完整的html:

<!DOCTYPE html>
<html lang="en">
<head>
   <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
   <title>Mad Libs</title>
   <link rel="stylesheet" type="text/css" href="Site.css">
</head>
<body>
    <h1 class="text">Quiz game</h1>
<div class="container">
    <nav>
        <ul>
            <li><a href="Quiz.php">quiz</a></li>
        </ul>
    </nav>

    <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST">
        <h1> quiz</h1>
    
        <?php
            if($_SERVER["REQUEST_METHOD"] == "POST"){
                $Input1 = $_POST["Input1"];
                $Input2 = $_POST["Input2"];
                $Input3 = $_POST["Input3"];
                $Input4 = $_POST["Input4"];
                $Input5 = $_POST["Input5"];
                $Input6 = $_POST["Input6"];
                $Input7 = $_POST["Input7"];

                echo "Driving a car can be fun if you follow this $Input1. advice:
                When approaching a $Input2 on the right, always blow your $Input4 Before making a
                $Input3 turn, always stick your $Input2 out of the window.
                Every 2000 miles, have your  $Input1.inspected and your $Input5 checked.
                When approaching a school, watch out for  $Input6. 
               Above all, drive $Input6 the $Input7 you save may be your own!$Input2";
            
        ?>

        <?php }else{ ?>
        <p>Question.. <input type="text"  name="Input1" placeholder="enter here"></p> 


        <p>Question.. <input type="text"  name="Input2" placeholder="enter here"></p>

        <p>Question.. <input type="text"  name="Input3" placeholder="enter here"></p>

        <p>Question.. <input type="text"  name="Input4" placeholder="enter here"></p>

        <p>Question.. <input type="text"  name="Input5" placeholder="enter here"></p>

        <p>Question.. <input type="text"  name="Input6" placeholder="enter here"></p>

        <p>Question.. <input type="text"  name="Input7" placeholder="enter here"></p>

        <input type="submit" name="submit" value="Send">
    </form>
    <?php } ?>

    <footer>
       <p>@2021.</p>
    </footer>
</div>
 </body>
</html>

标签: phphtmlregex

解决方案


我认为您不必验证输入是否是 php.ini 中带有空格的文本。您可以使用 html 输入模式属性。例如:

<!DOCTYPE html>
<html>
<body>
<form action="/action_page.php">
  <label for="maininput">Input</label>
  <input type="text" id="maininput" name="maininput" pattern="[A-Za-z\s]+" title="Write Here your Error"><br>
  <input type="submit">
</form>
</body>
</html>

在此示例中,输入仅接受字母和空格。您还可以通过将模式更改为 [A-Za-z0-9\s]+ 来添加数字。另外,如果您真的想继续使用 php 来验证输入,我认为错误是行中的验证if(!preg_match("/[^a-z0-9 _]+$/i", $Input1)){


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