Fatal编程技术网
  • php/
  • 如何使用PHP通过单击单独页面上的链接自动填充表单页面上的下拉菜单

如何使用PHP通过单击单独页面上的链接自动填充表单页面上的下拉菜单

php drop-down-menu

如何使用PHP通过单击单独页面上的链接自动填充表单页面上的下拉菜单,php,drop-down-menu,query-string,auto-populate,Php,Drop Down Menu,Query String,Auto Populate,所以我有两个页面，一个是contact.php页面，它有表单输入，等等。另一个页面是index.php，在这里我有链接，可以将您引导到contact.php页面 我试图做的是在单击索引页上的一个链接后，自动填充联系人页上的下拉菜单。因此，如果您单击“链接A”，那么它会将您重定向到在下拉菜单中选择“链接A”的联系人页面 我曾尝试在我的URL中使用查询字符串，例如：“URL？department=Shipping%20Department”，我相信我做得很好，但因为我没有在表单中使用GET，所以它不

所以我有两个页面，一个是contact.php页面，它有表单输入，等等。另一个页面是index.php，在这里我有链接，可以将您引导到contact.php页面

我试图做的是在单击索引页上的一个链接后，自动填充联系人页上的下拉菜单。因此，如果您单击“链接A”，那么它会将您重定向到在下拉菜单中选择“链接A”的联系人页面

我曾尝试在我的URL中使用查询字符串，例如：“URL？department=Shipping%20Department”，我相信我做得很好，但因为我没有在表单中使用GET，所以它不起作用

最后，表单需要能够在提交后发送电子邮件，这一点我都明白了，只是自动填充让我卡住了

我的任务表上写着“您还将有一个联系人页面，该页面将向邮件页面发送查询字符串，以自动填充部门字段”

下面是我到目前为止每一页的内容。 另外，请提前道歉，这是我的第一个PHP类，所以大部分内容都来自于课程，这可能是一个我没有看到的简单错误

Index.php

<?php
include('includes/validate.php');
include('includes/mail.php');

?>
<!doctype html>
<html class="no-js" lang="">

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .form-send {
          width: 100%;
          max-width: 400px;
          padding: 15px;
          margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>Contact Us</h1>

        <a href="contact.php">Shipping Department</a>
        <br/><br/>
        <a href="contact.php">Billing Inquiries</a>
        <br/><br/>
        <a href="contact.php">Party Planning Committee</a>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

<?php
include('includes/validate.php');
include('includes/mail.php');
$hasMailErrors = false;
$hasFormErrors = false; 
$isSentMail = false;


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

    $reply_to_email = validate_email($_POST['email']);
    $reply_to_name = validate_string($_POST['name']);
    $department = validate_string($_POST['department']);
    $message_subject = validate_string($_POST['message-subject']);
    $message_body = validate_string($_POST['message-body']);

    if ($reply_to_email != false &&
        $reply_to_name != false &&
        $department != false &&
        $message_subject != false &&
        $message_body != false) {

          $isSentMail = send_custom_mail (
            $reply_to_email,
            $reply_to_name,
            $department,
            $message_subject,
            "To Whom It May Concern, <br/> <br/>"
            .$message_body.
            "<br/> <br/> Sincerely, <br/> <br/>"
            .$reply_to_name."<br>".$reply_to_email
          );

          if ($isSentMail) {
            $hasMailErrors = true;
          }

        } else {
          $hasFormErrors = true;
        }

    //validate
}
?>
<!doctype html>
<html class="no-js" lang="">

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .form-send {
          width: 100%;
          max-width: 400px;
          padding: 15px;
          margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="container">

        <div class="text-center">
            <?php if (!$isSentMail) {?>
            <form class="form-send" method='post' action='<?php echo $_SERVER['PHP_SELF']; ?>'>
                <?php if ($hasFormErrors) { ?>
                <div class="alert alert-danger" role="alert">
                There was an error with the form
                </div>
                <?php } ?>

                <div class="form-input">
                    <label for="name">Name</label>
                    <input type="text" class="form-control" id="name" name="name" placeholder="name">
                </div>

                <div class="form-input">
                    <label for="email-field">Email address</label>
                    <input type="email" class="form-control" id="email-field" name="email" placeholder="name@example.com">
                </div>

                <div class="form-input">
                    <label for="department">Department</label>    
                    <select name="department" class="form-control" id="department">

                        <option selected="selected" value="Shipping Department">Shipping Department</option>

                        <option selected="selected" value="Billing Inquiries">Billing Inquiries</option>

                        <option selected="selected" value="Party Planning Committee">Party Planning Committee</option>

                    </select>
                </div>

                <div class="form-input">
                    <label for="subject">Subject</label>
                    <input type="text" class="form-control" id="subject" name="message-subject" placeholder="subject">
                </div>

                <div class="form-input">
                <label for="message-body">Enter Message Below</label>
                <textarea name="message-body" class="form-control" id="message-body" rows="3" placeholder="enter your message"></textarea>
                </div>

                <button class="submit-button" type="submit">Send</button>
            </form>
            <?php } else { ?>
            <h1>Thank you!</h1>
            <?php } ?>

        </div>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

<?php

require __DIR__.'/../vendor/autoload.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

function send_custom_mail($reply_to_email, $reply_to_name, $department, $subject, $message_body) {
    $gmail_username = "";
    $gmail_password = "";
    $gmail_name = "";

    $mailDebug = false;

    $mail = new PHPMailer(); 


    $mail->CharSet = "utf-8";
    $mail->IsSMTP(); 
    $mail->SMTPAuth = true; 


    $mail->Username = $gmail_username;
    $mail->Password = $gmail_password;

    $mail->SMTPSecure = "tls"; 

    if ($mailDebug) {
        $mail ->SMTPDebug = 2;
    }


    $mail->Host ="smtp.gmail.com";
    $mail->Port = "587";

    $mail->From = $gmail_username;
    $mail->FromName = $reply_to_name;


    $mail->AddReplyTo($reply_to_email, $reply_to_name);


    $mail->AddAddress($gmail_username, $gmail_name);


    $mail->IsHTML(true);
    $mail->Subject = $department.' - '.$subject;
    $mail->Body = $message_body;


    if ($mail->Send()) {

        return true;

    } else {


        if ($mailDebug) {
            echo $mail->ErrorInfo;
        }
        return false;

    }
}

<?php

function validate_email($email) {
    $email = filter_var($email, FILTER_SANITIZE_EMAIL); 
    $email = filter_var($email, FILTER_VALIDATE_EMAIL);
    return $email;
}

function validate_string($string) {
    $string = filter_var($string, FILTER_SANITIZE_STRING);

    if ($string === "") {
        return false;
    }
    return $string;
}


.表格寄出{
宽度：100%；
最大宽度：400px；
填充：15px；
保证金：0自动；
}
联系我们
这没有所有带有查询字符串的html链接

Contact.php

<?php
include('includes/validate.php');
include('includes/mail.php');

?>
<!doctype html>
<html class="no-js" lang="">

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .form-send {
          width: 100%;
          max-width: 400px;
          padding: 15px;
          margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>Contact Us</h1>

        <a href="contact.php">Shipping Department</a>
        <br/><br/>
        <a href="contact.php">Billing Inquiries</a>
        <br/><br/>
        <a href="contact.php">Party Planning Committee</a>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

<?php
include('includes/validate.php');
include('includes/mail.php');
$hasMailErrors = false;
$hasFormErrors = false; 
$isSentMail = false;


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

    $reply_to_email = validate_email($_POST['email']);
    $reply_to_name = validate_string($_POST['name']);
    $department = validate_string($_POST['department']);
    $message_subject = validate_string($_POST['message-subject']);
    $message_body = validate_string($_POST['message-body']);

    if ($reply_to_email != false &&
        $reply_to_name != false &&
        $department != false &&
        $message_subject != false &&
        $message_body != false) {

          $isSentMail = send_custom_mail (
            $reply_to_email,
            $reply_to_name,
            $department,
            $message_subject,
            "To Whom It May Concern, <br/> <br/>"
            .$message_body.
            "<br/> <br/> Sincerely, <br/> <br/>"
            .$reply_to_name."<br>".$reply_to_email
          );

          if ($isSentMail) {
            $hasMailErrors = true;
          }

        } else {
          $hasFormErrors = true;
        }

    //validate
}
?>
<!doctype html>
<html class="no-js" lang="">

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .form-send {
          width: 100%;
          max-width: 400px;
          padding: 15px;
          margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="container">

        <div class="text-center">
            <?php if (!$isSentMail) {?>
            <form class="form-send" method='post' action='<?php echo $_SERVER['PHP_SELF']; ?>'>
                <?php if ($hasFormErrors) { ?>
                <div class="alert alert-danger" role="alert">
                There was an error with the form
                </div>
                <?php } ?>

                <div class="form-input">
                    <label for="name">Name</label>
                    <input type="text" class="form-control" id="name" name="name" placeholder="name">
                </div>

                <div class="form-input">
                    <label for="email-field">Email address</label>
                    <input type="email" class="form-control" id="email-field" name="email" placeholder="name@example.com">
                </div>

                <div class="form-input">
                    <label for="department">Department</label>    
                    <select name="department" class="form-control" id="department">

                        <option selected="selected" value="Shipping Department">Shipping Department</option>

                        <option selected="selected" value="Billing Inquiries">Billing Inquiries</option>

                        <option selected="selected" value="Party Planning Committee">Party Planning Committee</option>

                    </select>
                </div>

                <div class="form-input">
                    <label for="subject">Subject</label>
                    <input type="text" class="form-control" id="subject" name="message-subject" placeholder="subject">
                </div>

                <div class="form-input">
                <label for="message-body">Enter Message Below</label>
                <textarea name="message-body" class="form-control" id="message-body" rows="3" placeholder="enter your message"></textarea>
                </div>

                <button class="submit-button" type="submit">Send</button>
            </form>
            <?php } else { ?>
            <h1>Thank you!</h1>
            <?php } ?>

        </div>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

<?php

require __DIR__.'/../vendor/autoload.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

function send_custom_mail($reply_to_email, $reply_to_name, $department, $subject, $message_body) {
    $gmail_username = "";
    $gmail_password = "";
    $gmail_name = "";

    $mailDebug = false;

    $mail = new PHPMailer(); 


    $mail->CharSet = "utf-8";
    $mail->IsSMTP(); 
    $mail->SMTPAuth = true; 


    $mail->Username = $gmail_username;
    $mail->Password = $gmail_password;

    $mail->SMTPSecure = "tls"; 

    if ($mailDebug) {
        $mail ->SMTPDebug = 2;
    }


    $mail->Host ="smtp.gmail.com";
    $mail->Port = "587";

    $mail->From = $gmail_username;
    $mail->FromName = $reply_to_name;


    $mail->AddReplyTo($reply_to_email, $reply_to_name);


    $mail->AddAddress($gmail_username, $gmail_name);


    $mail->IsHTML(true);
    $mail->Subject = $department.' - '.$subject;
    $mail->Body = $message_body;


    if ($mail->Send()) {

        return true;

    } else {


        if ($mailDebug) {
            echo $mail->ErrorInfo;
        }
        return false;

    }
}

<?php

function validate_email($email) {
    $email = filter_var($email, FILTER_SANITIZE_EMAIL); 
    $email = filter_var($email, FILTER_VALIDATE_EMAIL);
    return $email;
}

function validate_string($string) {
    $string = filter_var($string, FILTER_SANITIZE_STRING);

    if ($string === "") {
        return false;
    }
    return $string;
}


.表格寄出{
宽度：100%；
最大宽度：400px；
填充：15px；
保证金：0自动；
}
表单有错误
名称
电子邮件地址
部门
航运部
账单查询
党的计划委员会
主题
在下面输入消息
发送
非常感谢。
然后我有我的邮件和验证包括

Mail.php

<?php
include('includes/validate.php');
include('includes/mail.php');

?>
<!doctype html>
<html class="no-js" lang="">

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .form-send {
          width: 100%;
          max-width: 400px;
          padding: 15px;
          margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>Contact Us</h1>

        <a href="contact.php">Shipping Department</a>
        <br/><br/>
        <a href="contact.php">Billing Inquiries</a>
        <br/><br/>
        <a href="contact.php">Party Planning Committee</a>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

<?php
include('includes/validate.php');
include('includes/mail.php');
$hasMailErrors = false;
$hasFormErrors = false; 
$isSentMail = false;


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

    $reply_to_email = validate_email($_POST['email']);
    $reply_to_name = validate_string($_POST['name']);
    $department = validate_string($_POST['department']);
    $message_subject = validate_string($_POST['message-subject']);
    $message_body = validate_string($_POST['message-body']);

    if ($reply_to_email != false &&
        $reply_to_name != false &&
        $department != false &&
        $message_subject != false &&
        $message_body != false) {

          $isSentMail = send_custom_mail (
            $reply_to_email,
            $reply_to_name,
            $department,
            $message_subject,
            "To Whom It May Concern, <br/> <br/>"
            .$message_body.
            "<br/> <br/> Sincerely, <br/> <br/>"
            .$reply_to_name."<br>".$reply_to_email
          );

          if ($isSentMail) {
            $hasMailErrors = true;
          }

        } else {
          $hasFormErrors = true;
        }

    //validate
}
?>
<!doctype html>
<html class="no-js" lang="">

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .form-send {
          width: 100%;
          max-width: 400px;
          padding: 15px;
          margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="container">

        <div class="text-center">
            <?php if (!$isSentMail) {?>
            <form class="form-send" method='post' action='<?php echo $_SERVER['PHP_SELF']; ?>'>
                <?php if ($hasFormErrors) { ?>
                <div class="alert alert-danger" role="alert">
                There was an error with the form
                </div>
                <?php } ?>

                <div class="form-input">
                    <label for="name">Name</label>
                    <input type="text" class="form-control" id="name" name="name" placeholder="name">
                </div>

                <div class="form-input">
                    <label for="email-field">Email address</label>
                    <input type="email" class="form-control" id="email-field" name="email" placeholder="name@example.com">
                </div>

                <div class="form-input">
                    <label for="department">Department</label>    
                    <select name="department" class="form-control" id="department">

                        <option selected="selected" value="Shipping Department">Shipping Department</option>

                        <option selected="selected" value="Billing Inquiries">Billing Inquiries</option>

                        <option selected="selected" value="Party Planning Committee">Party Planning Committee</option>

                    </select>
                </div>

                <div class="form-input">
                    <label for="subject">Subject</label>
                    <input type="text" class="form-control" id="subject" name="message-subject" placeholder="subject">
                </div>

                <div class="form-input">
                <label for="message-body">Enter Message Below</label>
                <textarea name="message-body" class="form-control" id="message-body" rows="3" placeholder="enter your message"></textarea>
                </div>

                <button class="submit-button" type="submit">Send</button>
            </form>
            <?php } else { ?>
            <h1>Thank you!</h1>
            <?php } ?>

        </div>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

<?php

require __DIR__.'/../vendor/autoload.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

function send_custom_mail($reply_to_email, $reply_to_name, $department, $subject, $message_body) {
    $gmail_username = "";
    $gmail_password = "";
    $gmail_name = "";

    $mailDebug = false;

    $mail = new PHPMailer(); 


    $mail->CharSet = "utf-8";
    $mail->IsSMTP(); 
    $mail->SMTPAuth = true; 


    $mail->Username = $gmail_username;
    $mail->Password = $gmail_password;

    $mail->SMTPSecure = "tls"; 

    if ($mailDebug) {
        $mail ->SMTPDebug = 2;
    }


    $mail->Host ="smtp.gmail.com";
    $mail->Port = "587";

    $mail->From = $gmail_username;
    $mail->FromName = $reply_to_name;


    $mail->AddReplyTo($reply_to_email, $reply_to_name);


    $mail->AddAddress($gmail_username, $gmail_name);


    $mail->IsHTML(true);
    $mail->Subject = $department.' - '.$subject;
    $mail->Body = $message_body;


    if ($mail->Send()) {

        return true;

    } else {


        if ($mailDebug) {
            echo $mail->ErrorInfo;
        }
        return false;

    }
}

<?php

function validate_email($email) {
    $email = filter_var($email, FILTER_SANITIZE_EMAIL); 
    $email = filter_var($email, FILTER_VALIDATE_EMAIL);
    return $email;
}

function validate_string($string) {
    $string = filter_var($string, FILTER_SANITIZE_STRING);

    if ($string === "") {
        return false;
    }
    return $string;
}

请更新index.php中的链接，如下所示：


<a href="contact.php?department=Shipping Department">Shipping Department</a>

<a href="contact.php?department=Billing Inquiries">Billing Inquiries</a>

<a href="contact.php?department=Party Planning Committee">Party Planning Committee</a>






并更改contact.php中的选项，如下所示：


<?php $department = isset($_GET['department']) ? $_GET['department'] : "Shipping Departmen"; ?>

<option <?php if ($department == "Shipping Department"): ?>selected="selected"<?php endif; ?> value="Shipping Department">Shipping Department</option>

<option <?php if ($department == "Billing Inquiries"): ?>selected="selected"<?php endif; ?> value="Billing Inquiries">Billing Inquiries</option>

<option <?php if ($department == "Party Planning Committee"): ?>selected="selected"<?php endif; ?> value="Party Planning Committee">Party Planning Committee</option>




value=“运输部门”>运输部门
value=“账单查询”>账单查询
value=“党的计划委员会”>党的计划委员会



如果两个文件都在同一目录中，它应该可以工作。
如果您在
索引
页面上更改HTML，如下所示：


<a href="contact.php?department=shipping">Shipping Department</a>
<a href="contact.php?department=billing">Billing Inquiries</a>
<a href="contact.php?department=planning">Party Planning Committee</a>


通过将
selected hidden disabled
添加到
select
菜单中的初始
选项
，可以确保用户看到该菜单，并且必须从中选择一个选项，而不是依赖默认选择的菜单中的第一个选项。如果用户修改querystring变量的值未出现在departments数组的键中，则将再次显示此
请选择
，并且如果提交表单，将公布
错误
的值


一点：不要使用
$\u服务器['PHP\u SELF']
作为表单操作-如果脚本要发布到自身，则只需完全忽略该操作，因为
$\u服务器['PHP\u SELF']
容易被劫持。
它确实有效，谢谢！但是，当我在contact.php页面上使用下拉菜单时，选项现在会显示“注意：未定义索引：部门中…”。我如何才能使其成为正常选项？我已经更新了contact.php的相关代码，这将解决您的问题。谢谢，这已经解决了！！