【发布时间】：2014-04-20 14:58:23
【问题描述】：
请多多包涵，因为我是一名具有一定编码知识的平面设计师，但不如开发人员多。经过数小时的修补和询问 Google，我决定直接询问你们！
我一直在为我的网站构建联系表单。到目前为止一切顺利，除了一件事。我想添加一个简单的垃圾邮件预防字段。
我添加了一个带有问题 6+2=? 的字段“spamcheck”。但我不知道如何对 PHP 进行编码以要求该值具体为 8。只要正确填写了其他字段，无论在此处输入的数字如何，表单都会提交，尽管任何尝试弄乱代码（因此为什么你会看到我的 $spamcheck 变量，但当前的编码只要求它具有与其他字段一样的值）。
我已经包含了 PHP、PHP 调用的验证以及表单。如果表单有一些多余的代码，我们深表歉意；我尝试了许多不同版本的 PHP 表单教程，但均无济于事。
当然，非常感谢您的帮助！ :)
这是我直接放在网页中的PHP代码：
<?php
define("EMAIL", "email@gmail.com");
if(isset($_POST['submit'])) {
include('validate.class.php');
//assign post data to variables
$name = trim($_POST['name']);
$email = trim($_POST['email']);
$budget = trim($_POST['budget']);
$deadline = trim($_POST['deadline']);
$message = trim($_POST['message']);
$spamcheck = trim($_POST['spamcheck']);
//start validating our form
$v = new validate();
$v->validateStr($name, "name", 1, 50);
$v->validateEmail($email, "email");
$v->validateStr($budget, "budget");
$v->validateStr($deadline, "deadline");
$v->validateStr($message, "message", 1, 1000);
$v->validateStr($spamcheck, "spamcheck");
if(!$v->hasErrors()) {
$from = "website.com"; //Site name
// Change this to your email address you want to form sent to
$to = "email@gmail.com";
$subject = "Hello! Comment from " . $name . "";
$message = "Message from " . $name . "
Email: " . $email . "
Budget: " . $budget ."
Deadline: " . $deadline ."
Message: " . $message ."";
mail($to,$subject,$message,$from);
//grab the current url, append ?sent=yes to it and then redirect to that url
$url = "http". ((!empty($_SERVER['HTTPS'])) ? "s" : "") . "://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
header('Location: '.$url."?sent=yes");
} else {
//set the number of errors message
$message_text = $v->errorNumMessage();
//store the errors list in a variable
$errors = $v->displayErrors();
//get the individual error messages
$nameErr = $v->getError("name");
$emailErr = $v->getError("email");
$budgetErr = $v->getError("budget");
$deadlineErr = $v->getError("deadline");
$messageErr = $v->getError("message");
$spamcheckErr = $v->getError("spamcheck");
}//end error check
}// end isset
?>
这是它调用的 validate.class.php：
<?php
class validate {
public $errors = array();
public function validateStr($postVal, $postName, $min = 1, $max = 1000) {
if(strlen($postVal) < intval($min)) {
$this->setError($postName, ucfirst($postName)." is required.");
} else if(strlen($postVal) > intval($max)) {
$this->setError($postName, ucfirst($postName)." must be less than {$max} characters long.");
}
}// end validateStr
public function validateEmail($emailVal, $emailName) {
if(strlen($emailVal) <= 0) {
$this->setError($emailName, "Please enter an Email Address");
} else if (!preg_match('/^[^0-9][a-zA-Z0-9_]+([.][a-zA-Z0-9_]+)*[@][a-zA-Z0-9_]+([.][a-zA-Z0-9_]+)*[.][a-zA-Z]{2,4}$/', $emailVal)) {
$this->setError($emailName, "Please enter a Valid Email Address");
}
}// end validateEmail
private function setError($element, $message) {
$this->errors[$element] = $message;
}// end logError
public function getError($elementName) {
if($this->errors[$elementName]) {
return $this->errors[$elementName];
} else {
return false;
}
}// end getError
public function displayErrors() {
$errorsList = "<ul class=\"errors\">\n";
foreach($this->errors as $value) {
$errorsList .= "<li>". $value . "</li>\n";
}
$errorsList .= "</ul>\n";
return $errorsList;
}// end displayErrors
public function hasErrors() {
if(count($this->errors) > 0) {
return true;
} else {
return false;
}
}// end hasErrors
public function errorNumMessage() {
if(count($this->errors) > 1) {
$message = "There was an error sending your message!\n";
} else {
$message = "There was an error sending your message!\n";
}
return $message;
}// end hasErrors
}// end class
?>
这里是html/php的形式：
<span class="message"><?php echo $message_text; ?></span>
<?php if(isset($_GET['sent'])): ?><h2>Your message has been sent</h2><?php endif; ?>
<form role="form" method="post" action="webpage.php#contact">
<div class="form-group">
<input type="text" name="name" class="form-control" id="name" value="<?php echo htmlentities($name); ?>" placeholder="Full Name" required>
<label for="exampleInputName"><i class="icon-tag"></i></label>
<span class="errors"><?php echo $nameErr; ?></span>
<div class="clearfix"></div>
</div>
<div class="form-group">
<input type="email" name="email" class="form-control" id="email" value="<?php echo htmlentities($email); ?>" placeholder="Email" required>
<label for="exampleInputEmail1"><i class="icon-inbox"></i></label>
<span class="errors"><?php echo $emailErr; ?></span>
<div class="clearfix"></div>
</div>
<div class="form-group">
<input type="text" name="budget" class="form-control" id="budget" value="<?php echo htmlentities($budget); ?>" placeholder="Budget" required>
<label for="exampleInputBudget1"><i class="icon-usd"></i></label>
<span class="errors"><?php echo $budgetErr; ?></span>
<div class="clearfix"></div>
</div>
<div class="form-group">
<input type="text" name="deadline" class="form-control" id="deadline" value="<?php echo htmlentities($deadline); ?>" placeholder="Deadline" required>
<label for="exampleInputDeadline"><i class="icon-calendar"></i></label>
<span class="errors"><?php echo $deadlineErr; ?></span>
<div class="clearfix"></div>
</div>
<div class="form-group textarea">
<textarea rows="6" name="message" class="form-control" id="message" value="<?php echo htmlentities($message); ?>" placeholder="Write Message" required></textarea>
<label for="exampleInputMessage"><i class="icon-pencil"></i></label>
<span class="errors"><?php echo $messageErr; ?></span>
<div class="clearfix"></div>
</div>
<div class="form-group">
<input type="text" name="spamcheck" class="form-control" id="spamcheck" value="<?php echo htmlentities($spamcheck); ?>" placeholder="Spam check: 6+2=?" required>
<label for="exampleInputSpamCheck"><i class="icon-lock"></i></label>
<span class="errors"><?php echo $spamcheckErr; ?></span>
<div class="clearfix"></div>
</div>
<button type="submit" id="submit" name="submit" value="submit" class="btn btn-large">Send Message</button>
</form>
【问题讨论】：
标签： php html forms validation spam-prevention