Question

我确信最初的反应会是这样的，“难道这家伙不会有谷歌？”是的，我承认这看起来确实是一个非常基本的概念，我试过并试图绕过它，查看关于这个主题的各种帖子和文章等等，但都无济于事。也许你可以指出我正确的方向？

我有一个基本的联系表单（contact.html），我使用外部PHP脚本（contact.php）运行。这是HTML表单代码：

<form id="form1" action="contact.php" method="post">
<div class="form1">
<label>Your Name:</label>
<span><input type="text" name="name" /></span>
</div>
<div class="form1">
<label>Your School:</label>
<span><input type="text" name="school" /></span>
</div>
<div class="form1">
<label>Phone Number:</label>
<span><input type="text" name="phone" /></span>
</div>
<div class="form1">
<label>E-Mail Address:</label>
<span><input type="text" name="email" /></span>
</div>
<div class="form3">
<span><textarea cols="1" rows="1" name="message"></textarea></span>
</div>
<div class="wrapper">
<input class="submit" type="image" src="images/contact_submit.png" name="submit" alt="Submit" />
</div>
</form>

PHP脚本验证输入了所有字段，然后处理表单：

<?php

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

//Validate the name:
if (!empty($_POST['name'])) {
    $name = $_POST['name'];
} else {
    echo "You forgot to enter your name.<br>";
}

//Validate the school:
if (!empty($_POST['school'])) {
    $school = $_POST['school'];
} else {
    echo "You forgot to enter your school.<br>";
}

//Validate the e-mail:
if (!empty($_POST['email'])) {
    $email = $_POST['email'];
} else {
    echo "You forgot to enter your e-mail.<br>";
}

//Validate the message:
if (!empty($_POST['message'])) {
    $message = $_POST['message'];
} else {
    echo "You forgot to enter a message.";
}

if (!empty($_POST['name']) && !empty($_POST['school']) && !empty($_POST['email']) && !empty($_POST['message'])) {
    $phone = $_POST['phone'];
    $body = "$name\n$school\n$phone\n$email\n\n$message";
    mail("***", "PAL Website - Message from a Visitor", $body);
    header("Location: confirm.html");
}

}

?>

一切都很好，表格按照预期进行验证和处理。但是，我真的想要设置它，以便错误消息显示在同一页面上，或者至少刷新表单并包含错误消息。

我已经在其他演示中看到了这一点（例如Larry Ullman的书），但仍然无法弄清楚如何实现它。你能提出建议吗？什么是最简单的方法呢？

以下是页面网址，如果有帮助：http://www.712jefferson.org/pal/contact.html

谢谢！

Answer 1

我会使用jQuery。修改：

HTML中的

：将id添加到您的输入文件中，这样您就可以使用jQuery“抓取”它们（您可以在下面的$.post方法中查看用法。）

<form id="form1" action="contact.php" method="post">
   <div class="form1">
      <label>Your Name:</label>
      <span><input id="name" type="text" name="name" /></span>
   </div>
   <div class="form1">
      <label>Your School:</label>
      <span><input id="school" type="text" name="school" /></span>
   </div>
   <div class="form1">
      <label>Phone Number:</label>
      <span><input id="phone" type="text" name="phone" /></span>
   </div>
   <div class="form1">
      <label>E-Mail Address:</label>
      <span><input id="email" type="text" name="email" /></span>
   </div>
   <div class="form3">
      <span><textarea id="message" cols="1" rows="1" name="message"></textarea></span>
   </div>
   <div class="wrapper">
      <input class="submit" type="image" src="images/contact_submit.png" name="submit" alt="Submit" />
   </div>
</form>

PHP中的

：如果验证中没有错误，请回复：“成功”

if (!empty($_POST['name']) && !empty($_POST['school']) && !empty($_POST['email']) && !empty($_POST['message'])) {
    echo "success";
    $phone = $_POST['phone'];
    $body = "$name\n$school\n$phone\n$email\n\n$message";
    mail("***", "PAL Website - Message from a Visitor", $body);
    header("Location: confirm.html");
}

将jQuery库附加到您的网站，并在括号内的HTML文件或附加到您网站的外部* .js文件中使用以下代码。在您的HTML文件的部分中使用：

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>

jQuery脚本：

$('#form1').submit(function() {
    event.preventDefault(); 
    $.post("contact.php", {name: $("#name").val(), school: $("#school").val(), phone: $("#phone").val(), email: $("#email").val(), message: $("#message").val()}, function(data){
        if(data !="success"){
            alert(data);
        }
    });
});

这会在警告窗口中显示您的错误消息，如果我没记错，您的网站将不会重新加载。

Answer 2

有很多方法可以做到这一点，所以这是一个基于意见的问题，它将为您提供几种实现这一目标的方法。

如果响应中的任何错误显示导致错误的输入附近的错误，您可以执行ajax请求以提交没有重新加载页面的数据和调用成功。这需要使用javascript并为错误设置隐藏元素并显示它或生成包含错误的元素并将其附加到DOM。

当Amal Murali显示并将html和验证脚本放在同一个脚本文件中并立即输出错误，甚至更好地回应导致它们的输入附近的错误

另一种方法是让contact.php进行验证，然后在无效数据上打印出contact.html，然后再将错误放在输入附近。

Answer 3

    <?php
    // define variables and set to empty values
    $firstnameErr = $lastnameErr = $usernameErr = $passwordErr = $genderErr = $courseErr = "";
    $firstname = $lastname = $username = $password = $gender = $comments = "";
    $course = array();
    //var_dump($_POST['gender']);
    //exit;
    if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['submit'])) {

    $variables = array();
    $variables = initialize();
    $errors = array();
    $errors = validate_errors($variables);

    if (count($errors) == 0) {
        //database operation
        //exit;
    }
    }  
    function clean($data) {
    $data = strip_tags(htmlspecialchars(stripslashes(trim($data)))); 
     //trim :- Strip whitespace (or other characters) from the beginning and end of a string
     //The stripslashes() function removes backslashes.Prevents XSS
     //htmlspecialchars :- Converts the predefined characters "<" (less than) and ">" (greater than) to HTML entities:< (less than) becomes &lt; and > (greater than) becomes &gt;Helps in preventing XSS
     //The strip_tags() function strips a string from HTML, XML, and PHP tags.
    return $data;
    }

    function initialize(){
    $var = array();
    $var['firstname'] = clean($_POST['firstname']);
    $var['lastname'] = clean($_POST['lastname']);
    $var['username'] = clean($_POST['username']);
    $var['password'] = clean($_POST['password']);
    if(!empty($_POST['gender'])) {                //if-else condition is used because here we don't type in any data,but just select data
    $var['gender'] = $_POST['gender'];
    }  else {
        $var['gender'] = '';
    }
    //var_dump($_POST[gender]);
    if(!empty($_POST['course'])) {               //if-else condition is used because here we don't type in any data,but just select data
    $var['course'] = $_POST['course'];
    } else {
        $var['course'] = '';
    }
    $var['comments'] = clean($_POST['comments']);
    return $var;
     }

    function validate_errors($var) {    //is an array being passed into this function??have a look at arg of validateFirstName.
    $errors = array();

    $errors['firstname'] = validateFirstName($var['firstname']);//should return error string or ''
    $errors['lastname'] = validateLastname($var['lastname']);
    $errors['username'] = validateUserName($var['username']);
    $errors['password'] = validatePassword($var['password']);
    $errors['gender'] = validateGender($var['gender']);
    $errors['course'] = validateCourse($var['course']);
    $errors['comments'] = validateComments($var['comments']);
    return $errors;
   }

      function validateFirstName($fname){

      if(empty($fname)){
        global $firstnameErr;
        $firstnameErr = "First name is required";
        return $firstnameErr;
    } else if (!preg_match("/^[a-zA-Z ]*$/", $fname)){ // check if name only contains letters and whitespace.Performs a regular expression match
        global $firstnameErr;
        $firstnameErr = "Only letters are allowed";
        return $firstnameErr;
    } else {
        global $firstname;
       $firstname = $fname;
       return ''; 
    }   
}    

function validateLastName($lname){

    if(empty($lname)){
        return '';
    } else if (!preg_match("/^[a-zA-Z ]*$/", $lname)) { // check if name only contains letters and whitespace,performs a regular expression match
        global $lastnameErr;
        $lastnameErr = "Only letters are allowed";
         return $lastnameErr;
    } else {
        global $lastname;
        $lastname = $lname;
       return ''; 
    }
}

function validateUserName($uname) {

    if(empty($uname)) {
        global $usernameErr;
        $usernameErr = "Username is required";
        return $usernameErr;
    } else if (!preg_match("/^[a-zA-Z0-9 ]*$/", $uname)){ // checks if username contains only letters and digits
        global $usernameErr;
        $usernameErr = "Only letters and digits are allowed";
        return $usernameErr;
    } else {
        global $username;
        $username = $uname;
       return ''; 
    }  
}

function validatePassword($pword){

    if(empty($pword)) {
        global $passwordErr;
        $passwordErr = "Password is required";
        return $passwordErr;
    } else if (preg_match("/^.*(?=.{8,})(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).*$/", $pword) === 0) {
        global $passwordErr;
        $passwordErr = "Password must be at least 8 characters and must contain at least one lower case letter, one upper case letter and one digit";
        return $passwordErr;
    } else {
        global $password;
        $password = $pword;
       return '';  
    }
}    

function validateGender($gen){

    if(empty($gen)) {
        global $genderErr;
        $genderErr = "Gender is required";  
      return $genderErr;
    } else {
        global $gender;
        $gender = $gen;
        return '';
    }
}

function validateCourse($cour){

    if(empty($cour)) {
        global $courseErr;
        $courseErr = "Select atleast one";
        return $courseErr;
    } else {
        global $course;
        $course = $cour;
        return '';
    }
}

function validateComments($comm){

    if(empty($comm)) {
        return '';
    } else {
        global $comments;
        $comments = $comm;
        return '';
    }
}


    //renderform();



    ?>


    <html>
    <head>
        <title>Sample Form</title>
        <style>
            .error {color: #FF0000;}
        </style>
    </head>
    <body>
        <p><span class="error">* required field.</span></p>
        <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>"> 
            <label for="firstname">Firstname:</label>
            <input type="text" name="firstname" id="firstname" value="<?php echo $firstname; ?>" /><span class="error">* <?php echo $firstnameErr; ?></span><br/><br/>
            <label for="lastname">Lastname:</label>
            <input type="text" name="lastname" id="lastname" value="<?php echo $lastname; ?>" /><span class="error"> <?php echo $lastnameErr; ?></span><br/><br/>
            <label for="username">Username:</label>
            <input type="text" name="username" id="username" value="<?php echo $username; ?>" /><span class="error">* <?php echo $usernameErr; ?></span><br/><br/>
            <label for="password">Password:</label>
            <input type="password" name="password" id="password" /><span class="error">* <?php echo $passwordErr; ?></span><br/><br/>
            Gender:
            <label for="male">Male</label>
            <input type="radio" name="gender" id="male" <?php if (isset($gender) && $gender == "male") echo "checked"; ?> value="male" />  
            <label for="female">Female</label>
            <input type="radio" name="gender" id="female" <?php if (isset($gender) && $gender == "female") echo "checked"; ?> value="female" /><span class="error">* <?php echo $genderErr; ?></span><br/><br/>
            <label for="course">Course:</label>
            PHP<input type="checkbox" name="course[]" id="course" <?php if((!empty($_POST["course"])&& in_array("PHP",$_POST["course"]))){echo "checked";}?> value="PHP" />
            HTML<input type="checkbox" name="course[]" id="course" <?php if((!empty($_POST["course"])&& in_array("HTML",$_POST["course"]))){echo "checked";}?> value="HTML" />
            CSS<input type="checkbox" name="course[]" id="course" <?php if((!empty($_POST["course"])&& in_array("CSS",$_POST["course"]))){echo "checked";}?> value="CSS" />
            Javascript<input type="checkbox" name="course[]" id="course" <?php if((!empty($_POST["course"])&& in_array("Javascript",$_POST["course"]))){echo "checked";}?> value="Javascript" /><span class="error">* <?php echo $courseErr; ?></span><br/><br/>
            <label for="comments">Comments:</label><br/>
            <textarea name="comments" rows="4" cols="20" id="comments"/><?php echo $comments; ?></textarea><br/><br/>
        <input type = "submit" value="Submit" name="submit">
    </form>
     <?php
    echo "<h2>Your Input:</h2>";
    echo "Firstname:" . $firstname;
    echo "<br>";
    echo "Lastname:" . $lastname;
    echo '<br>';
    echo "Username:" . $username;
    echo '<br>';
    echo "Password:" . $password;
    echo '<br>';
    echo "Gender:" . $gender;
    echo '<br>';
    global $string;
    $string = implode(",",$course);
    echo "Course(/s):" . $string;
    echo '<br>';
    echo "Comments:" . $comments;
    echo '<br>';
    ?>
    </body>
    </html>

Answer 4

index.php的代码（此文件先运行）

<?php
define('PROJECT',$_SERVER['DOCUMENT_ROOT'].'PhpSample');
include (PROJECT.'/utilities.php');
include ('constant.php');

if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['submit'])) {

$errors = validate_errors($variables);
$counter = 0;
foreach ($errors as $value) {
    if ($value === '') {
        $counter++;
    }
}

//if there are no errors
if ($counter == 7) {
    //database operation
    $con = mysqli_connect($host, $user, $pword);
    if (!$con) {
        echo 'Error connecting to database. Please try again later';
        exit;
    }
    $val = cleanandinsert($variables,$con,$dbname);
    mysqli_close($con);
    if(!$val){
        echo 'Could not register. Please try again later';
        exit;
    }
    header("Location:http://localhost/PhpSample/target.php?vals=" .     urlencode(serialize($variables))); 
    exit;
  }
}


include('myform.phtml');
?>

target.php代码

<?php
include 'process.php';
$Values= unserialize(urldecode($_GET['vals'])); 
echo "<h2>Your Input:</h2>";
echo "Firstname:".$Values['firstname'];
echo "<br>";
echo "Lastname:".$Values['lastname'] ;
echo '<br>';
echo "Username:".$Values['username'] ;
echo '<br>';
echo "Password:".$Values['password'] ; 
echo '<br>';
echo "Gender:".$Values['gender'] ;
echo '<br>';
if (!empty($Values['course'])) {
    $string = implode(',', $Values['course']);
} else {
    $string = "";
}
echo "Course(/s):" . $string;
echo '<br>';
echo "Comments:".$Values['comments'] ; 
echo '<br>';
?>

constant.php的代码

<?php
// define variables and set to empty values
$firstnameErr = $lastnameErr = $usernameErr = $passwordErr = $genderErr = $courseErr     = "";
$firstname = $lastname = $username = $password = $gender = $comments = "";
$course = array();
$variables = initialize();
$host = 'localhost';
$user = 'root';
$pword = '';
$dbname = 'mydb';
$tablename = 'userdata';
?>

myform.phtml代码

<html>
<head>
    <title>Sample Form</title>
    <style>
        .error {color: #FF0000;}
    </style>
</head>
<body>
    <p><span class="error">* required field.</span></p>
    <form method="post" action="./index.php"> 
        <label for="firstname">Firstname:</label>                                                           
        <input type="text" name="firstname" id="firstname" value="<?php if (isset($variables['firstname']) ? print_r($variables['firstname']) : '') ; ?>" /><span class="error">* <?php if (isset($errors['firstname']) ? print_r($errors['firstname']) : '') ; ?></span><br/><br/>
        <label for="lastname">Lastname:</label>
        <input type="text" name="lastname" id="lastname" value="<?php if (isset($variables['lastname']) ? print_r($variables['lastname']) : '') ; ?>" /><span class="error"> <?php if (isset($errors['lastname']) ? print_r($errors['lastname']) : '') ; ?></span><br/><br/>
        <label for="username">Username:</label>
        <input type="text" name="username" id="username" value="<?php if (isset($variables['username']) ? print_r($variables['username']) : '') ; ?>" /><span class="error">* <?php if (isset($errors['username']) ? print_r($errors['username']) : '') ; ?></span><br/><br/>
        <label for="password">Password:</label>
        <input type="password" name="password" id="password" /><span class="error">* <?php if (isset($errors['password']) ? print_r($errors['password']) : '') ; ?></span><br/><br/>
        Gender:
        <label for="male">Male</label>
        <input type="radio" name="gender" id="male" <?php if (isset($variables['gender']) && ($variables['gender'] == "male")) echo "checked"; ?> value="male" />  
        <label for="female">Female</label>
        <input type="radio" name="gender" id="female" <?php if (isset($variables['gender']) && ($variables['gender'] == "female")) echo "checked"; ?> value="female" /><span class="error">* <?php if (isset($errors['gender']) ? print_r($errors['gender']) : '') ; ?></span><br/><br/>
        <label for="course">Course:</label>
        PHP<input type="checkbox" name="course[]" id="course" <?php echo getChecked("PHP") ?>  value="PHP" />
        HTML<input type="checkbox" name="course[]" id="course" <?php echo getChecked("HTML") ?> value="HTML" />
        CSS<input type="checkbox" name="course[]" id="course" <?php echo getChecked("CSS") ?> value="CSS" />
        Javascript<input type="checkbox" name="course[]" id="course" <?php echo getChecked("Javascript") ?> value="Javascript" /><span class="error">* <?php if (isset($errors['course']) ? print_r($errors['course']) : '') ; ?></span><br/><br/>
        <label for="comments">Comments:</label><br/>
        <textarea name="comments" rows="4" cols="20" id="comments"/><?php if (isset($variables['comments']) ? print_r($variables['comments']) : '') ; ?></textarea><br/><br/>
    <input type = "submit" value="Submit" name="submit">
</form>

utilities.php代码

<?php

/ ** *它清除变量并从交叉站点cripting返回变量。 * @return变量没有空白，删除斜杠，标签。 * /

function clean($data, $ishtmltype = FALSE) {
if ($ishtmltype) {  //for database operation
    $data = htmlspecialchars(stripslashes(trim($data)));
    return $data;
}
$data = strip_tags(htmlspecialchars(stripslashes(trim($data))));

return $data;
}

/ ** *它返回一个变量数组，这些变量在＆＃34; clean（）＆＃34;的帮助下被清理。 * @return $ var数组 * /

  function initialize() {
   $var = array();
   $var['firstname'] = isset($_POST['firstname']) ? clean($_POST['firstname']) : '';
   $var['lastname'] = isset($_POST['lastname']) ? clean($_POST['lastname']) : '';
   $var['username'] = isset($_POST['username']) ? clean($_POST['username']) : '';
   $var['password'] = isset($_POST['password']) ? $_POST['password'] : '';
   if (!empty($_POST['gender'])) {                
    $var['gender'] = $_POST['gender'];
   } else {
    $var['gender'] = '';
  }
  //var_dump($_POST[gender]);
   if (!empty($_POST['course'])) {               
    $var['course'] = $_POST['course'];
   } else {
    $var['course'] = '';
   }
   $var['comments'] = isset($_POST['comments']) ? clean($_POST['comments']) : '';
    return $var;
   }

/ ** *它返回一个错误变量数组，其中包含错误消息 * @param类型$ var数组 * @return $ errors数组 * /

function validate_errors($var) {    
$errors = array();

$errors['firstname'] = validateFirstName($var['firstname']); //should return error   string or ''
$errors['lastname'] = validateLastname($var['lastname']);
$errors['username'] = validateUserName($var['username']);
$errors['password'] = validatePassword($var['password']);
$errors['gender'] = validateGender($var['gender']);
$errors['course'] = validateCourse($var['course']);
$errors['comments'] = validateComments($var['comments']);
return $errors;
}

/ ** *它在名字中返回错误消息（如果有） * @param类型$ fname * @return string如果找不到则返回null * /

function validateFirstName($fname) {

if (empty($fname)) {
    $firstnameErr = "First name is required";
    return $firstnameErr;
} else if (!preg_match("/^[a-zA-Z']*$/", $fname)) { // check if name only contains   letters and whitespace.Performs a regular expression match
    $firstnameErr = "Only letters are allowed";
    return $firstnameErr;
}
  else if (strlen($fname) < 3){
    $firstnameErr = "Atleast 3 characters";
    return $firstnameErr;
  }
   else if (strlen($fname) > 60){
    $firstnameErr = "Not more than 60 characters";
    return $firstnameErr;
  }
return '';
}

/ ** *它在姓氏中返回错误消息（如果有） * @param类型$ lname * @return string如果找不到则返回null * /

function validateLastName($lname) {

if (empty($lname)) {
    return '';
} else if (!preg_match("/^[a-zA-Z ]*$/", $lname)) { // check if name only contains letters and whitespace,performs a regular expression match
    $lastnameErr = "Only letters are allowed";
    return $lastnameErr;
}
else if (strlen($lname) > 60){
    $firstnameErr = "Not more than 60 characters";
    return $firstnameErr;
  }
return '';
}

/ ** *它在用户名中返回错误消息（如果有） * @param类型$ uname * @return string如果找不到则返回null * /

function validateUserName($uname) {

if (empty($uname)) {
    $usernameErr = "Username is required";
    return $usernameErr;
} else if (!preg_match("/^[a-zA-Z0-9 ]*$/", $uname)) { // checks if username contains only letters and digits
    $usernameErr = "Only letters and digits are allowed";
    return $usernameErr;
}
else if (strlen($uname) < 3){
    $firstnameErr = "Atleast 3 characters";
    return $firstnameErr;
  }
   else if (strlen($uname) > 60){
    $firstnameErr = "Not more than 60 characters";
    return $firstnameErr;
  }
  return '';
}

/ ** *它在密码中返回错误消息（如果有） * @param类型$ pword * @return string如果找不到则返回null * /

function validatePassword($pword) {

if (empty($pword)) {
    $passwordErr = "Password is required";
    return $passwordErr;
} else if (preg_match("/^.*(?=.{8,})(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).*$/", $pword)     === 0) {
    $passwordErr = "Password must be at least 8 characters and must contain at least one lower case letter, one upper case letter and one digit";
    return $passwordErr;
}
return '';
}

/ ** *它会在性别中返回错误消息（如果有） * @param类型$ gen * @return string如果找不到则返回null * /

function validateGender($gen) {

if (empty($gen)) {
    $genderErr = "Gender is required";
    return $genderErr;
} else if (($gen != "male") && ($gen != "female")) {
    $genderErr = "Not a valid selection";
    return $genderErr;
}
return '';

}

/ ** *它会在课程中返回错误消息（如果有） * @param类型$ cour * @return string如果找不到则返回null * /

function validateCourse($cour) {

if (empty($cour)) {
    $courseErr = "Select atleast one";
    return $courseErr;
} else if (array_values($cour) != ("PHP" && "HTML" && "CSS" && "Javascript")) {
    $courseErr = "Not a valid selection";
    return $courseErr;
}
return '';
}

/ ** *它不会返回错误消息，但接受任何内容 * @param类型$ comm * @return null * /

function validateComments($comm) {

if (empty($comm)) {
    return '';
}
return '';
}

/ ** *它删除字符串中的任何特殊字符，并将验证的用户数据插入数据库 * @param类型$ variables数组 * @param类型$ con * @param类型$ dbname * @return布尔值 * /

function cleanandinsert($variables, $con, $dbname) {

$firstname = mysqli_real_escape_string($con, $variables['firstname']); //The mysqli_real_escape_string() function escapes special characters in a string for use in an SQL statement.
$lastname = mysqli_real_escape_string($con, $variables['lastname']);
$username = mysqli_real_escape_string($con, $variables['username']);
$password = sha1($variables['password']);    
$gender = mysqli_real_escape_string($con, $variables['gender']);
$string = implode(',', ($variables['course']));
$course = mysqli_real_escape_string($con, $string);
$comments = mysqli_real_escape_string($con, $variables['comments']);
$sql = "INSERT INTO $dbname.userdata (firstname,lastname,username,password,gender,course,comments)
                VALUES ('$firstname','$lastname','$username','$password','$gender','$course','$comments')";

if (!mysqli_query($con, $sql)) {

        return FALSE;        
}
return TRUE;
}

/ ** *它检查提交错误数据的已选中复选框，即它会记住选中的复选框。 * @param类型$课程 * @return选中复选框，如果未选中复选框，则返回null * /

function getChecked($course){
if(!empty($_POST['course']) && in_array($course, $_POST["course"])){
    return 'checked';
}
return '';
}

?>

Answer 5

您可以为代码使用梯形if..else结构在if()中你会提出你的条件，如果条件为假，它将转到错误信息然后你可以把主表格的链接，以便用户可以回去...

Answer 6

有很多方法可以做到这一点，但是这样做的简单方法是＆＃34;将你的整个表单代码放在php文件中，然后只创建一个文件，我不确定但它应该有效，错误将是如下所示，首先编写表单代码，然后编写php脚本＆＃34;。：）

在同一页面上显示PHP表单验证结果

6 个答案: