Question

首先，这不是编写整体代码的最佳方法，但我正在尝试练习switch语句，因此我使用相同的表单和错误消息来练习不同的php函数和语句等

在这种特殊情况下，案例编号（案例1，案例2，案例3等）都包含在我的echo语句中，我不知道为什么

因此，在给出的示例中，在用户名下的表单中输入字母C并期望错误输出为＆＃34;用户名必须至少为6个字符＆＃34;但是实际出现的是什么＆＃34;用户名必须至少为6个字符2＆＃34;

我已尝试将各种if语句的初始变量设置的数字值放入＆＃34;＆＃34;当我得到case switch语句时，如果它必须作为文本读取，但这没有任何区别

对此有任何帮助将不胜感激。可能非常简单。请不要嘲笑我的代码......太多了

`

<?php 
##### Form Handling ####
if ( $_SERVER[ 'REQUEST_METHOD'] == 'POST')

### Error Handling ###

// define variables and set to empty values
$userErr = $firstnameErr = $surnameErr = $emailErr = "";
$user = $firstname = $surname = $email = "";


if ($_SERVER["REQUEST_METHOD"] == "POST") 
{
  if (empty($_POST["user"])) 
  {
    $userErr = 1;
  } 
  else 
  {
    $user = $_POST["user"];
    if (strlen($user) < 6) {
        $userErr = 2;
    } 
    if(strlen(trim($username)) != strlen($username)) {
        $userErr = 3;
    }
  }

  if (empty($_POST["firstname"])) {
    $firstnameErr = "First name is required";
  } else {
    $firstname = $_POST["firstname"];
    if (!preg_match("/^[a-zA-Z ]*$/",$firstname))
       {$firstnameErr = "Only letters and white space allowed"; }
  }

  if (empty($_POST["surname"])) {
    $surnameErr = "Surname is required";
  } else {
    $surname = $_POST["surname"];
    if (!preg_match("/^[a-zA-Z ]*$/",$surname))
       {$surnameErr = "Only letters and white space allowed"; }
  }

  if (empty($_POST["email"])) {
    $emailErr = "Email is required";
  } else {
    $email = $_POST["email"];
    if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
        {  $emailErr = "Invalid email format"; }
  }
} 
?>

<form action="form_register.php" method="POST">
<p>Username:
<input type="text" name="user" value="<?php echo $user;?>"> 
<?php 
switch($userErr) 
    {
    case 1:
        echo "Username is required";
        break;
    case 2:
        echo "Username must be a minimum of 6 characters";
        break;
    case 3:
        echo "Must not contain any spaces";
        break;
    default:
        echo "*";
        break;
    }
echo $userErr;?> </p>



<p>First Name:
<input type="text" name="firstname" value="<?php if ( isset ($_POST['firstname']))
    echo $_POST['firstname'] ; ?>"> </p>
<p>Surname:
<input type="text" name="surname" value="<?php if ( isset ($_POST['surname']))
    echo $_POST['surname'] ; ?>"> </p>
<p>Email Address:
<input type="text" name="email" value="<?php if ( isset ($_POST['email']))
    echo $_POST['email'] ; ?>"> </p>
<p><input type="submit"></p>
</form>

`

Answer 1

直接在案件阻止之后，您回复了号码本身：

echo $userErr;?>

删除echo，它应该可以正常工作。

PHP switch语句 - echo错误

1 个答案: