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Php 我想知道当验证失败时如何停止表单提交？

php forms validation

Php 我想知道当验证失败时如何停止表单提交？,php,forms,validation,Php,Forms,Validation,我是php新手，下面是我的代码 当任何字段为空时，我希望停止表单提交 <!DOCTYPE HTML> <html> <head> <style> .error {color: #FF0000;} </style> </head> <body> <?php // define variables and set to empty values $nameErr = $emailErr = $gender

我是php新手，下面是我的代码

当任何字段为空时，我希望停止表单提交

<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 

<?php
// define variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")
{

   if (empty($_POST["name"]))
     {$nameErr = "Name is required";}
   else if (empty($_POST["email"]))
     {$emailErr = "Email is required";}
   else if (empty($_POST["website"]))
     {$website = "";}
   else if (empty($_POST["comment"]))
     {$comment = "";}
   else if (empty($_POST["gender"]))
     {$genderErr = "Gender is required";}

}
?>

<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="welcome.php"> 
   <label>Name:</label> <input type="text" name="name"> <span class="error">* <?php echo $nameErr;?></span>
   <br><br>
   <label>E-mail:</label> <input type="text" name="email"> <span class="error">* <?php echo $emailErr;?></span>
   <br><br>
   <label>Website:</label> <input type="text" name="website"> <span class="error"><?php echo $websiteErr;?></span>
   <br><br>
   <label>Comment:</label> <input type="text" name="comment">
   <br><br>
   <label>Gender:</label>
   <input type="radio" name="gender" value="female">Female
   <input type="radio" name="gender" value="male">Male
   <span class="error">* <?php echo $genderErr;?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>
</body>
</html>


.错误{color:#FF0000；}
PHP表单验证示例
*必填字段

姓名：*



电子邮件：*



网站：



评论：



性别：
女性
男性
*
听起来您想用PHP进行验证，但停止向PHP提交数据。这是不可能的。如果您希望在PHP中进行验证，则无论发生什么情况，都将提交所有数据。如果需要，可以使用
exit（）
停止PHP的执行。否则，您将需要使用JavaScript（您可以在这里或通过Google找到大量关于表单的信息）在客户端验证表单。

如果您想打印所有错误，那么您的代码应该如下所示

<?php session_start(); error_reporting(0);?>
<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 
<?php

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
   if (empty($_POST["name"]))
     {$_SESSION['name']= "Name is required";}
   if (empty($_POST["email"]))
     {$_SESSION['email'] = "Email is required";}
   if (empty($_POST["website"]))
     {$_SESSION['website'] = "Website is required";}
   if (empty($_POST["comment"]))
     {$_SESSION['comment'] = "comment is required";}
   if (empty($_POST["gender"]))
     {$_SESSION['gender'] = "Gender is required";}
}
if($_POST['name']!="" && $_POST['email']!="" && $_POST['website']!="" && 

$_POST['gender']!="")
{
    header("Location: welcome.php");
}
?>

<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action=""> 
   <label>Name:</label> <input type="text" name="name"> <span class="error">* <?php echo $_SESSION['name'];?></span>
   <br><br>
   <label>E-mail:</label> <input type="text" name="email"> <span class="error">* <?php echo $_SESSION['email'];?></span>
   <br><br>
   <label>Website:</label> <input type="text" name="website"> <span class="error"><?php echo $_SESSION['website'];?></span>
   <br><br>
   <label>Comment:</label> <input type="text" name="comment">
   <br><br>
   <label>Gender:</label>
   <input type="radio" name="gender" value="female">Female
   <input type="radio" name="gender" value="male">Male
   <span class="error">* <?php echo $_SESSION['gender'];?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>
</body>
</html>
<?php 
    unset($_SESSION['name']);
    unset($_SESSION['email']);
    unset($_SESSION['website']);
    unset($_SESSION['comment']);
    unset($_SESSION['gender']);
?>


.错误{color:#FF0000；}
PHP表单验证示例
*必填字段

姓名：*



电子邮件：*



网站：



评论：



性别：
女性
男性
*
如果要访问欢迎页面中的所有变量。代码如下所示

home.php

<?php session_start(); error_reporting(0);?>
<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 


<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="welcome.php"> 
   <label>Name:</label> <input type="text" name="name"> <span class="error">* <?php echo $_SESSION['name'];?></span>
   <br><br>
   <label>E-mail:</label> <input type="text" name="email"> <span class="error">* <?php echo $_SESSION['email'];?></span>
   <br><br>
   <label>Website:</label> <input type="text" name="website"> <span class="error"><?php echo $_SESSION['website'];?></span>
   <br><br>
   <label>Comment:</label> <input type="text" name="comment">
   <br><br>
   <label>Gender:</label>
   <input type="radio" name="gender" value="female">Female
   <input type="radio" name="gender" value="male">Male
   <span class="error">* <?php echo $_SESSION['gender'];?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>
</body>
</html>
<?php 
    unset($_SESSION['name']);
    unset($_SESSION['email']);
    unset($_SESSION['website']);
    unset($_SESSION['comment']);
    unset($_SESSION['gender']);
?>

<?php
session_start();
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
   if (empty($_POST["name"]))
     {$_SESSION['name']= "Name is required";}
   if (empty($_POST["email"]))
     {$_SESSION['email'] = "Email is required";}
   if (empty($_POST["website"]))
     {$_SESSION['website'] = "Website is required";}
   if (empty($_POST["comment"]))
     {$_SESSION['comment'] = "comment is required";}
   if (empty($_POST["gender"]))
     {$_SESSION['gender'] = "Gender is required";}

}
if(empty($_POST["name"]) || empty($_POST["email"]) || empty($_POST["website"]) || empty($_POST["gender"]))
{
    header("Location: home.php");
}

echo $_POST['name'];
?>


.错误{color:#FF0000；}
PHP表单验证示例
*必填字段

姓名：*



电子邮件：*



网站：



评论：



性别：
女性
男性
*
welcome.php

<?php session_start(); error_reporting(0);?>
<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 


<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="welcome.php"> 
   <label>Name:</label> <input type="text" name="name"> <span class="error">* <?php echo $_SESSION['name'];?></span>
   <br><br>
   <label>E-mail:</label> <input type="text" name="email"> <span class="error">* <?php echo $_SESSION['email'];?></span>
   <br><br>
   <label>Website:</label> <input type="text" name="website"> <span class="error"><?php echo $_SESSION['website'];?></span>
   <br><br>
   <label>Comment:</label> <input type="text" name="comment">
   <br><br>
   <label>Gender:</label>
   <input type="radio" name="gender" value="female">Female
   <input type="radio" name="gender" value="male">Male
   <span class="error">* <?php echo $_SESSION['gender'];?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>
</body>
</html>
<?php 
    unset($_SESSION['name']);
    unset($_SESSION['email']);
    unset($_SESSION['website']);
    unset($_SESSION['comment']);
    unset($_SESSION['gender']);
?>

<?php
session_start();
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
   if (empty($_POST["name"]))
     {$_SESSION['name']= "Name is required";}
   if (empty($_POST["email"]))
     {$_SESSION['email'] = "Email is required";}
   if (empty($_POST["website"]))
     {$_SESSION['website'] = "Website is required";}
   if (empty($_POST["comment"]))
     {$_SESSION['comment'] = "comment is required";}
   if (empty($_POST["gender"]))
     {$_SESSION['gender'] = "Gender is required";}

}
if(empty($_POST["name"]) || empty($_POST["email"]) || empty($_POST["website"]) || empty($_POST["gender"]))
{
    header("Location: home.php");
}

echo $_POST['name'];
?>
如果您想在提交之前验证数据，您应该更具体地使用javascript jquery来验证数据客户端本身

给表单一个这样的id

method=“post”action=“welcome.php”id=“form1”

和所有表单元素的ID 

$('#form1').submit(function() {
     your validation rules here

     if($('#email').val().length == 0)
       return false;
    else 
       return true;
});

return false停止提交

如果你要做前端，而不仅仅是php，你真的应该尝试一下jquery，它会让你的生活更轻松

我你需要的表单不会被提交如果任何字段都是空的，为什么不试试这个

<label>Name:</label> <input type="text" name="name" required> <span class="error">* <?php echo $nameErr;?></span>
   <br><br>
    <label>E-mail:</label> <input type="text" name="email" required> <span class="error">* <?php echo $emailErr;?></span>
       <br><br>
       <label>Website:</label> <input type="text" name="website" required> <span class="error"><?php echo $websiteErr;?></span>
       <br><br>
       <label>Comment:</label> <input type="text" name="comment" required>
       <br><br>
       <label>Gender:</label>
       <input type="radio" name="gender" value="female" required>Female
       <input type="radio" name="gender" value="male" required>Male

Name:*



电子邮件：*



网站：



评论：



性别：
女性
男性
Javascript是客户端，PHP是服务器端，因此在未按下提交按钮“将数据发布到服务器”之前，您可以使用PHP验证表单。。检查字段执行不同的操作，如数据库插入、计算等，您不能将响应发送回客户端并告诉他您在这里遇到了此错误，我不打算处理此类数据。您可以使用ajax在服务器端实时验证表单。最好的方法是验证客户端，然后在使用来自总是撒谎的客户端的所有数据（因为每个人都撒谎）之前，在服务器上进行另一次检查。下面是一个

这是另一种使用PHP实现PDO数据库的方法：

  • 在您完成所有必需的字段并显示必需的输入错误消息之前，它不会提交到您的数据库
  • 如果忘记填写一个必填字段并提交，则不会清除所有字段
我在连接中添加了一个If语句

<?php
 // define variables and set to empty values
   $nameErr = $emailErr = $cityErr = $commentErr = $genderErr = "";
   $name = $email = $city = $comment = $gender = "";

  if ($_SERVER["REQUEST_METHOD"] == "POST") {
   if (empty($_POST["name"])) {
     $nameErr = "Please add a name";
  } else {
      $name = validateInput($_POST["name"]);
      // check if name only contains letters and whitespace
      if (!preg_match("/^[a-zA-Z ]+/",$name)) {$nameErr = "Only letters and white 
      space allowed";} 
    }

  if (empty($_POST["email"])) {
    $emailErr = "Please add an email";
  } else {
     $email = validateInput($_POST["email"]);
     // check if email is an email format
      if (!filter_var($email, FILTER_VALIDATE_EMAIL)){
        $emailErr = "Invalid email format";
      }
    }

 if (empty($_POST["city"])) {
    $cityErr = "Please add your city";
  } else {
    $city = validateInput($_POST["city"]);
    // check if city only contains letters and whitespace
    if (!preg_match("/^[a-zA-Z ]*$/",$city)) {
        $cityErr = "Only letters and white space allowed";
    }
  }

  if (empty($_POST["comment"])) {
    $commentErr = "Please add your comment";
  } else {
    $comment = validateInput($_POST["comment"]);
       // check if comment only contains letters and whitespace
       if (!preg_match("/^[a-zA-Z ]*$/",$comment)) {
        $commentErr = 'Only "/", "-", "+", and numbers';  
    }
  }

  if (empty($_POST["gender"])) {
    $genderErr = "Please pick your gender";
  } else {
    $gender = validateInput($_POST["gender"]);

    }
}

// Validate Form Data 
function validateInput($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
  }


if(!empty($_POST["name"]) && !empty($_POST["email"]) && !empty($_POST["city"]) && !empty($_POST["comment"]) && !empty($_POST["gender"]))
  {
  $servername = "localhost";
  $username = "root";
  $password = "";
  $dbname = "myDBPDO";

  try {
      $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
      // set the PDO error mode to exception
      $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
      $sql = "INSERT INTO info (name, email, city, comment, gender)
      VALUES ('$name', '$email', '$city', '$comment', '$gender')";
      // use exec() because no results are returned
      $conn->exec($sql);
      echo "Success! Form Submitted!";
      }
  catch(PDOException $e)
      {
      echo $sql . "<br>" . $e->getMessage();
      }

  $conn = null;
}

?>

<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 




<h2>PHP Form</h2>
<p>Doesn't submit until the required fields you want are filled</p>


<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
  <div class="error">
    <p><span>* required field</span></p>
    <div><?php echo $nameErr;?></div>
    <div><?php echo $emailErr;?></div>
    <div><?php echo $cityErr;?></div>
    <div><?php echo $commentErr;?></div>
    <div><?php echo $genderErr;?></div>              
  </div>
    <label for="name">Name:
      <input type="text" name="name" id="name" placeholder="" value="<?php echo $name;?>">
        <span class="error">*</span>
    </label>
    <label for="email">Email:
      <input type="email" name="email" id="email" placeholder="" value="<?php echo $email;?>">
        <span class="error">*</span>
    </label>
    <label for="city">city:
      <input type="text" name="city" id="city" placeholder="" value="<?php echo $city;?>">
       <span class="error">*</span>
    </label>
    <label for="comment">comment:
      <input type="text" name="comment" id="comment" value="<?php echo $comment;?>">
        <span class="error">*</span>
    </label>
    <label for="gender">Gender:<br>
      <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">Female
      <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">Male
      <input type="radio" name="gender" <?php if (isset($gender) && $gender=="other") echo "checked";?> value="other">Other  
        <span class="error">*</span>
    </label>
   <input type="submit" name="submit" value="Submit"> 

</form>
</body>
</html>

您可以对错误执行数组


$errors = []; // empty array 

if(isset($_POST['username']) && empty($_POST['username'])) {
   $errors['userName'] = "The userName is empty";
}

// then check if no errors , insert it to your DB :
if(count($errors) <= 0) {
 // after filtering the username from XSS , insert it to DB.
}else {
 // If there are ERRORS , even if one error :
 foreach($errors as $error) {
 // you can print all your errors 
}
}

// or use then in onther place like this :
if(isset($errors['username'])) { 
  echo $erros['username'];
}



$errors=[]；//空数组
if（设置（$\u POST['username']）和空（$\u POST['username']））{
$errors['userName']=“用户名为空”；
}
//然后检查是否没有错误，将其插入数据库：

如果（count（$errors）您可以使用此函数停止表单：


$("form").submit(function(a){
    a.preventDefault();
});



我想在这个页面中显示错误，并阻止将其导航到“welcome.php”？？？是的，错误将显示在页面上，请尝试这种方式。最后不要忘记取消设置所有会话变量。最后的意思是确切的位置？因为我对phpi JU粘贴整个代码非常陌生…但是如果我在所有d字段都为空的情况下单击提交按钮，页面将移动到欢迎。php..我觉得@shashank太懒了ng的人只会为他们做他们的工作……他们询问的答案很清楚。这篇文章对我的目的很有帮助，谢谢Sumit:）…仅供参考…这可能会被接受为答案。我不想接受html5的帮助，我知道使用js或jquery实现这一点的其他各种方法，我想知道它在php中是否可能。我不想接受js或jquery的帮助，我想知道它在php中是否可能。然后在最后添加一个else并添加您的提交代码那里