我试图从用户那里获取信息，经过多次检查后，我想将数据输入数据库。只要表单操作设置为不同的文件（例如：form action = "addnewuser.php"），我在这方面就很成功。但是，我希望在同一页上授权表单，并显示表单本身遇到的任何错误。我知道这是一个多步骤的过程，所以现在我只使用php而不是jquery来显示错误。然而，当我将php文件addnewuser.php的内容复制并粘贴到html表单页面时，它不会显示任何错误。我一直在学习各种网络教程，它们的代码似乎运行得很好。我还无法发现代码中的错误。非常感谢您的帮助。
代码：filename-form.php
<?php
if (($_SERVER['REQUEST_METHOD'] == 'POST') && (!empty($_POST['action']))):
/*** begin our session ***/
$firstname = $_REQUEST['firstname'];
$lastname = $_REQUEST['lastname'];
$username = $_REQUEST['username'];
$password = $_REQUEST['password'];
$password_conf = $_REQUEST['password_conf'];
$emailid = $_REQUEST['emailid'];
$team_name = $_REQUEST['team_name'];
// $secret_answer = $_REQUEST['secret_answer'];
//$secret_question = $_REQUEST['question'];
/*** first check that both the username, password and form token have been sent ***/
if(!isset( $username, $password ))
{
echo '<div>Please enter a valid username and password</div>';
}
/*** check the form token is valid ***/
// if( $_POST['form_token'] != $_SESSION['form_token'])
// {
// echo = 'Invalid form submission';
// }
/*** check the username is the correct length ***/
if (strlen( $username) > 20 || strlen($username) < 4)
{
echo 'Incorrect Length for Username';
}
if (ctype_alpha($firstname) != true)
{
/*** if there is no match ***/
echo "Username cannot contain numbers";
}
if (ctype_alpha($lastname) != true)
{
/*** if there is no match ***/
echo "Lastname cannot contain numbers";
}
/*** check the password is the correct length ***/
if (strlen( $password) > 20 || strlen($password) < 4)
{
echo 'Incorrect Length for Password';
}
/*** check the username has only alpha numeric characters ***/
if (ctype_alnum($username) != true)
{
/*** if there is no match ***/
echo "Username must be alpha numeric";
}
/*** check the password has only alpha numeric characters ***/
if (ctype_alnum($password) != true)
{
/*** if there is no match ***/
echo "Password must be alpha numeric";
}
else
{
/*** if we are here the data is valid and we can insert it into database ***/
// $firstname = filter_var($firstname, FILTER_SANITIZE_STRING);
// $lastname = filter_var($lastname, FILTER_SANITIZE_STRING);
$username = filter_var($username, FILTER_SANITIZE_STRING);
$password = filter_var($password, FILTER_SANITIZE_STRING);
// $emailid = filter_var($emailid, FILTER_SANITIZE_STRING);
// $team_name = filter_var($team_name, FILTER_SANITIZE_STRING);
/*** now we can encrypt the password ***/
$password = sha1( $password );
/*** connect to database ***/
/*** mysql hostname ***/
$mysql_hostname = 'localhost';
/*** mysql username ***/
$mysql_username = 'root';
/*** mysql password ***/
$mysql_password = 'hassan28';
/*** database name ***/
$mysql_dbname = 'adb project';
try
{
$dbh = new PDO("mysql:host=$mysql_hostname;dbname=$mysql_dbname", $mysql_username, $mysql_password);
/*** echo = a message saying we have connected ***/
/*** set the error mode to excptions ***/
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
/*** prepare the insert ***/
$stmt = $dbh->prepare("INSERT INTO users (firstname,lastname,username, password,emailid,team_name) VALUES ('$firstname', '$lastname',:username, :password,'$emailid', '$team_name')");
/*** bind the parameters ***/
$stmt->bindParam(':username', $username, PDO::PARAM_STR);
$stmt->bindParam(':password', $password, PDO::PARAM_STR, 40);
/*** execute the prepared statement ***/
$stmt->execute();
/*** unset the form token session variable ***/
/***unset( $_SESSION['form_token'] ); ***/
/*** if all is done, say thanks ***/
echo 'New user added';
}
catch(Exception $e)
{
/*** check if the username already exists ***/
if( $e->getCode() == 23000)
{
echo 'Username already exists';
}
else
{
/*** if we are here, something has gone wrong with the database ***/
echo 'We are unable to process your request. Please try again later"';
}
}
}
endif;
?>
<form class="form-inline" method="POST" action="<?php echo $_SERVER['PHP_SELF']?>" >
<span id="formerror" class="error"></span>
<p><input type="text" class="span2" maxlength = "20" name="firstname" id="firstname" placeholder="First Name"></p>
<p><input type="text" class="span2" maxlength = "20" name="lastname" id="lastame" placeholder="Last Name"></p>
<p><input type="text" class="span2" maxlength = "20" name="username" id="username" placeholder="Username"></p>
<p class="help-block" style="font-size:12px"> Username should be between 4-20 characters long.</p>
<p><input type="password" class="span2" name="password" placeholder="Password"></p>
<p class="help-block" style="font-size:12px"> Password must be between 4-20 characters long. Must be alpha-numeric</p>
<p><input type="password" class="span2" name="password_conf" placeholder="Re - Enter Password"></p>
<p><input type="email" class="span4" name="emailid" id="emailid" placeholder="Emaid ID"></p>
<p><input type="text" class="span2" name="team_name" id="team_name" placeholder="Team name"></p>
<p class="help-block" style="font-size:12px"> Select your Unique team name.</p>
<p>
<select class="secret_question">
<option value ="city_name">The name of the city where you were born</option>
<option value ="first_pet">The name of your first pet</option>
<option value ="mother_name">What is your mother's maiden name</option>
</select>
</p>
<p><input type="text" class="span2" name="secret_answer" id="secret_answer" placeholder="Secret Answer"></p>
<p><input type="hidden" value="submit" /><br />
<button type="submit" name="action" class="btn btn-primary">Register</button></p>
</form>
在表单中，哪个字段是重新请求的，您只需使用"重新请求"。例如：
<form class="form-inline" method="POST" action="<?php echo $_SERVER['PHP_SELF']?>" >
<span id="formerror" class="error"></span>
<p><input type="text" class="span2" maxlength = "20" name="firstname" id="firstname" placeholder="First Name" required></p>
<p><input type="text" class="span2" maxlength = "20" name="username" id="username" placeholder="Username" required></p>
<p><input type="email" class="span4" name="emailid" id="emailid" placeholder="Emaid ID" required></p>
<p><input type="hidden" value="submit" /><br />
<button type="submit" name="action" class="btn btn-primary">Register</button></p>
为了自己的清晰起见，我对您的代码进行了清理，请随时提出任何问题。
- 我将消息保存到变量中
- 我在模板中输出它们
您的代码
class MyQuickException extends Exception {
public function __construct($code) {
switch ($code) {
case 0: $message = 'Please enter a valid username and password'; break;
case 1: $message = 'Invalid form submission'; break;
case 2: $message = 'Incorrect Length for Username'; break;
case 3: $message = 'Username cannot contain numbers'; break;
case 4: $message = 'Lastname cannot contain numbers'; break;
case 5: $message = 'Incorrect Length for Password'; break;
case 6: $message = 'Username must be alpha numeric'; break;
case 7: $message = 'Password must be alpha numeric'; break;
default: break;
}
parent::__construct($message,$code);
}
}
if (($_SERVER['REQUEST_METHOD'] === 'POST') && (!empty($_POST['action']))) {
/*** begin our session ***/
$firstname = $_REQUEST['firstname'];
$lastname = $_REQUEST['lastname'];
$username = $_REQUEST['username'];
$password = $_REQUEST['password'];
$password_conf = $_REQUEST['password_conf'];
$emailid = $_REQUEST['emailid'];
$team_name = $_REQUEST['team_name'];
//$secret_answer = $_REQUEST['secret_answer'];
//$secret_question = $_REQUEST['question'];
try {
$error = '';
if(!isset($username,$password)) throw new MyException(0);
if( $_POST['form_token'] != $_SESSION['form_token']) throw new MyException(1);
if (strlen( $username) > 20 || strlen($username) < 4) throw new MyException(2);
if (!ctype_alpha($firstname)) throw new MyException(3);
if (!ctype_alpha($lastname)) throw new MyException(4);
if (strlen( $password) > 20 || strlen($password) < 4) throw new MyException(5);
if (!ctype_alnum($username)) throw new MyException(6);
if (!ctype_alnum($password)) throw new MyException(7);
} catch (Exception $e) {
$error = $e->getMessage();
}
if (!$error) {
// $firstname = filter_var($firstname, FILTER_SANITIZE_STRING);
// $lastname = filter_var($lastname, FILTER_SANITIZE_STRING);
$username = filter_var($username,FILTER_SANITIZE_STRING);
$password = filter_var($password,FILTER_SANITIZE_STRING);
// $emailid = filter_var($emailid, FILTER_SANITIZE_STRING);
// $team_name = filter_var($team_name, FILTER_SANITIZE_STRING);
$password = sha1($password);
$mysql_hostname = 'localhost';
$mysql_username = 'root';
$mysql_password = 'hassan28';
$mysql_dbname = 'adb project';
try {
$dbh = new PDO("mysql:host=$mysql_hostname;dbname=$mysql_dbname", $mysql_username, $mysql_password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->prepare("INSERT INTO users (firstname,lastname,username, password,emailid,team_name) VALUES ('$firstname', '$lastname',:username, :password,'$emailid', '$team_name')");
$stmt->bindParam(':username',$username,PDO::PARAM_STR);
$stmt->bindParam(':password',$password,PDO::PARAM_STR, 40);
$stmt->execute();
//unset($_SESSION['form_token']);
$msg = 'New user added';
} catch(Exception $e) {
$msg = $e->getCode() == 23000 ? 'Username already exists' : 'We are unable to process your request. Please try again later"';
}
}
}
?>
<!-- messages will be output here, change to fit your needs -->
<p><?php echo $error ? $error : $msg; ?></p>
<form class="form-inline" method="POST" action="<?php echo $_SERVER['PHP_SELF']?>" >
<span id="formerror" class="error"></span>
<p><input type="text" class="span2" maxlength="20" name="firstname" id="firstname" placeholder="First Name"></p>
<p><input type="text" class="span2" maxlength="20" name="lastname" id="lastame" placeholder="Last Name"></p>
<p><input type="text" class="span2" maxlength="20" name="username" id="username" placeholder="Username"></p>
<p class="help-block" style="font-size:12px"> Username should be between 4-20 characters long.</p>
<p><input type="password" class="span2" name="password" placeholder="Password"></p>
<p class="help-block" style="font-size:12px"> Password must be between 4-20 characters long. Must be alpha-numeric</p>
<p><input type="password" class="span2" name="password_conf" placeholder="Re - Enter Password"></p>
<p><input type="email" class="span4" name="emailid" id="emailid" placeholder="Emaid ID"></p>
<p><input type="text" class="span2" name="team_name" id="team_name" placeholder="Team name"></p>
<p class="help-block" style="font-size:12px"> Select your Unique team name.</p>
<p>
<select class="secret_question">
<option value ="city_name">The name of the city where you were born</option>
<option value ="first_pet">The name of your first pet</option>
<option value ="mother_name">What is your mother's maiden name</option>
</select>
</p>
<p><input type="text" class="span2" name="secret_answer" id="secret_answer" placeholder="Secret Answer"></p>
<p><input type="hidden" value="submit" /></p>
<button type="submit" name="action" class="btn btn-primary">Register</button></p>
</form>
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