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带附件的Contact Form无附件提交报错问题求助

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DevOps 小满
2026-7-23
问题：无附件提交联系表单时出现错误并页面空白

我开发了一个带文件附件功能的联系表单，填写完整表单并附加文件时可正常运行；但不附加文件提交时，页面变成空白（表单不可见），同时提示：Sorry, there was an error uploading your file.。我推测问题出在缺少必要的条件判断，相关代码如下：

<?php
    
    // debug
error_reporting(E_ALL); // Ez a report all errors
ini_set("display_errors", 1);

if(isset($_POST['submit'])){
    // Get the submitted form data

    $name = trim($_POST['name']); 
    $email = trim($_POST['email']); 
    $dropdown = trim($_POST['dropdown']);
    $message = trim($_POST['message']); 
 
    //validation for email
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
 
    if (!preg_match($email_exp, $email)) {
        echo "<p style='color:red;'>A megadott E-mail cím érvénytelen.</p>";
        exit;
    }
   
    
    // Upload attachment file
    if(!empty($_FILES["attachment"]["name"])){
        foreach ($_FILES["attachment"]["name"] as $key => $val) {
    
            $fileerror = $_FILES['attachment']['error'][$key]; // get the error (if any)
            //validate form field for attaching the file
            if($fileerror > 0)
            {
                echo "<p style='color:red;'>Feltöltési hiba vagy Nincs fájl feltöltve.</p>";
                exit;
            }
             
            // Attachment path config
            $targetDir = "uploads/";
            $fileName = basename($_FILES['attachment']['name'][$key]);
            $targetFilePath = $targetDir . $fileName;
            $fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);
             
            // Allow certain attachment formats
            $allowTypes = array('jpg', 'png', 'jpeg');
            if(in_array($fileType, $allowTypes)){
                // Check the attachment size
                if ($_FILES['attachment']['size'][$key] > 6000000) {
                    echo "<p style='color:red;'>A csatolt kép nem haladhatja meg a 6MB-ot</p>";
                    exit;
                }else{
                    // Upload attachment to the server
                    if(move_uploaded_file($_FILES['attachment']['tmp_name'][$key], $targetFilePath)){
                        $uploadedFile = $targetFilePath;
                    }else{
                        echo "<p style='color:red;'>Sorry, there was an error uploading your file.</p>";
                        exit;
                    }
                }
            }else{
                echo "<p style='color:red;'>Sorry, only JPG, JPEG, & PNG files are allowed to upload.</p>";
                exit;
            }
        }
    }
}


if(isset($_POST['submit'])){
    //If everything above is ok then move further 
 
    //Use PHPmailer
    require "phpmailer/PHPMailerAutoload.php";
    $mail = new PHPMailer;
    $mail->CharSet = "UTF-8";
    $mail->Encoding = "16bit";
 
    //Mailbody to send in an email
    $mailbody ='';
 
    //Sender email address
    $sender = "";     // Gmail SMTP username
    $mail->isSMTP();                  // Set mailer to use SMTP
    $mail->SMTPDebug = 0;               //See errors, change it to 4
    $mail->Host = '';   // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;           // Enable SMTP authentication
    $mail->Username = $sender;        // SMTP username
    $mail->Password = '';// Gmail SMTP password
    $mail->SMTPSecure = 'ssl';        // Enable TLS encryption, `SSL` also accepted
    $mail->Port = 465;                // TCP port to connect to  
 
    $mail->setFrom($sender, $name); 
 
    $mail->addAddress('pixelkontakthu@gmail.com', 'PixelKontakt');     // Add a recipient
    //$mail->addAddress('name@example.com'); //add more recipient (optional)
    $mail->addReplyTo($email, $name);
    //$mail->addCC('cc@example.com');
    //$mail->addBCC('bcc@example.com');
 
    //Add attachment 

    if(is_array($_FILES)) {
        foreach ($_FILES["attachment"]["name"] as $key => $val) {
            $fileName = basename($_FILES['attachment']['name'][$key]);
            $targetFilePath = $targetDir . $fileName;
            $uploadedFile = $targetFilePath;
            $mail->AddAttachment($uploadedFile, $_FILES["attachment"]["name"][$key], 'base64', 'mime/type');
        }
    }

 
    $mail->isHTML(true);    // Set email format to HTML
    $mail->Encoding = 'base64';
    $mail->Subject = $dropdown.'-ra jelentkezett '.$name;
    $mail->Body = $mailbody;
    //$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';
 
    //Email your contact form data with an attachment using Gmail SMTP with PHPMailer
    if(!$mail->send()){
        echo "<p style='color:red;'>Message could not be sent. Please try again.</p>";
        echo 'Mailer Error: ' . $mail->ErrorInfo;
    }else{
        echo "<p style='color:green;'>Üzenet sikeresen elküldve!</p>";
        //To delete all sent files from the uploaded folder;
        foreach ($_FILES["attachment"]["name"] as $key => $val) {
            $fileName = basename($_FILES['attachment']['name'][$key]);
            $targetFilePath = $targetDir . $fileName;
            $uploadedFile = $targetFilePath;
            @unlink($uploadedFile);
        }
    }
}
?>

我排查了以下代码段，但没找到解决办法：

// Upload attachment file
if(!empty($_FILES["attachment"]["name"])){
    foreach ($_FILES["attachment"]["name"] as $key => $val) {

问题根源与修复方案

1. 文件错误码判断逻辑错误

无附件时，$_FILES['attachment']['error']会返回UPLOAD_ERR_NO_FILE（错误码4），属于正常情况，但原代码直接判断$fileerror > 0就终止程序，导致误判。修改错误判断逻辑：

// 替换原错误判断
if($fileerror > 0 && $fileerror != 4)
{
    echo "<p style='color:red;'>Feltöltési hiba vagy Nincs fájl feltöltve.</p>";
    exit;
}
// 跳过无文件的项
if($fileerror == 4) continue;

2. 变量作用域问题

$targetDir仅在有附件时定义，无附件时第二个判断块调用该变量会触发未定义错误。将$targetDir移到第一个判断块顶部全局定义：

// 在获取表单数据后添加
$targetDir = "uploads/";

3. 无附件时的循环处理

原代码在添加附件时直接遍历$_FILES["attachment"]["name"]，无附件时该数组不存在会触发警告。修改为仅当有附件时执行循环：

// 替换原添加附件代码
if(!empty($_FILES["attachment"]["name"])) {
    foreach ($_FILES["attachment"]["name"] as $key => $val) {
        $fileName = basename($_FILES['attachment']['name'][$key]);
        $targetFilePath = $targetDir . $fileName;
        $mail->AddAttachment($targetFilePath, $_FILES["attachment"]["name"][$key]);
    }
}

4. 合并重复的提交判断

两个独立的isset($_POST['submit'])块易导致逻辑混乱，将邮件发送代码合并到第一个判断块内，避免变量作用域问题。

修复后的完整代码 

<?php
// debug
error_reporting(E_ALL);
ini_set("display_errors", 1);

if(isset($_POST['submit'])){
    // Get the submitted form data
    $name = trim($_POST['name']); 
    $email = trim($_POST['email']); 
    $dropdown = trim($_POST['dropdown']);
    $message = trim($_POST['message']); 
    $targetDir = "uploads/"; // 全局定义路径

    //validation for email
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
    if (!preg_match($email_exp, $email)) {
        echo "<p style='color:red;'>A megadott E-mail cím érvénytelen.</p>";
        exit;
    }
   
    // Upload attachment file
    $uploadedFiles = [];
    if(!empty($_FILES["attachment"]["name"])){
        foreach ($_FILES["attachment"]["name"] as $key => $val) {
            $fileerror = $_FILES['attachment']['error'][$key];
            // 排除无文件的正常情况（错误码4）
            if($fileerror > 0 && $fileerror != 4)
            {
                echo "<p style='color:red;'>Feltöltési hiba vagy Nincs fájl feltöltve.</p>";
                exit;
            }
            // 跳过无文件的项
            if($fileerror == 4) continue;
            
            $fileName = basename($_FILES['attachment']['name'][$key]);
            $targetFilePath = $targetDir . $fileName;
            $fileType = strtolower(pathinfo($targetFilePath,PATHINFO_EXTENSION));
            
            // Allow certain attachment formats
            $allowTypes = array('jpg', 'png', 'jpeg');
            if(!in_array($fileType, $allowTypes)){
                echo "<p style='color:red;'>Sorry, only JPG, JPEG, & PNG files are allowed to upload.</p>";
                exit;
            }
            // Check the attachment size
            if ($_FILES['attachment']['size'][$key] > 6000000) {
                echo "<p style='color:red;'>A csatolt kép nem haladhatja meg a 6MB-ot</p>";
                exit;
            }
            // Upload attachment to the server
            if(move_uploaded_file($_FILES['attachment']['tmp_name'][$key], $targetFilePath)){
                $uploadedFiles[] = $targetFilePath;
            }else{
                echo "<p style='color:red;'>Sorry, there was an error uploading your file.</p>";
                exit;
            }
        }
    }

    // Use PHPmailer
    require "phpmailer/PHPMailerAutoload.php";
    $mail = new PHPMailer;
    $mail->CharSet = "UTF-8";
    $mail->Encoding = "16bit";

    // Mailbody to send in an email
    $mailbody = "Név: $name<br>E-mail: $email<br>Kategória: $dropdown<br>Üzenet: $message"; // 补充邮件内容

    // Sender email address
    $sender = "";     // Gmail SMTP username
    $mail->isSMTP();
    $mail->SMTPDebug = 0;
    $mail->Host = '';   // Specify main and backup SMTP servers
    $mail->SMTPAuth = true;
    $mail->Username = $sender;
    $mail->Password = '';// Gmail SMTP password
    $mail->SMTPSecure = 'ssl';
    $mail->Port = 465;

    $mail->setFrom($sender, $name);
    $mail->addAddress('pixelkontakthu@gmail.com', 'PixelKontakt');
    $mail->addReplyTo($email, $name);

    // Add attachment
    foreach($uploadedFiles as $filePath){
        $mail->AddAttachment($filePath, basename($filePath));
    }

    $mail->isHTML(true);
    $mail->Encoding = 'base64';
    $mail->Subject = $dropdown.'-ra jelentkezett '.$name;
    $mail->Body = $mailbody;

    // Send email
    if(!$mail->send()){
        echo "<p style='color:red;'>Message could not be sent. Please try again.</p>";
        echo 'Mailer Error: ' . $mail->ErrorInfo;
    }else{
        echo "<p style='color:green;'>Üzenet sikeresen elküldve!</p>";
        // Delete uploaded files
        foreach($uploadedFiles as $filePath){
            @unlink($filePath);
        }
    }
}
?>

内容的提问来源于stack exchange，提问作者PixelKontakt

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最近更新时间：2026.07.23 07:27:02