无php.ini用默认配置功能异常，PHP新手表单发邮件问题求助

Hey there! Let's work through your PHP form-to-email issue step by step—since you're just getting started with PHP, we'll break this down into manageable parts to get your setup working correctly.

First, your snippet was cut off, so here's a polished, secure version of the PHPMailer implementation that handles validation, proper SMTP setup, and error handling:

<?php
// Note: If you're using a modern PHPMailer version, PHPMailerAutoload.php is deprecated. Use Composer's autoloader instead
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php'; // Adjust this path to match your Composer setup

$errors = '';
$myemail = 'randomtext@gmail.com';
$mypassword = 'randomtext'; // For Gmail, use an App Password if 2FA is enabled (more on this later)

// Validate all required form fields first
if(empty($_POST['fname']) || empty($_POST['lname']) || empty($_POST['email']) || empty($_POST['message'])) {
    $errors .= "\n Error: All form fields are required";
}

// Sanitize and format form data
$fullName = trim($_POST['fname']) . ' ' . trim($_POST['lname']);
$senderEmail = filter_var(trim($_POST['email']), FILTER_VALIDATE_EMAIL);
$messageText = nl2br(trim($_POST['message']));

// If validation passes, send the email
if(empty($errors) && $senderEmail) {
    $mail = new PHPMailer(true); // Enables exception handling for easier debugging
    try {
        // Server configuration (tailor to your email provider)
        $mail->SMTPDebug = 0; // Set to 2 if you need detailed debug logs
        $mail->isSMTP();
        $mail->Host = 'smtp.gmail.com'; // Gmail's SMTP server
        $mail->SMTPAuth = true;
        $mail->Username = $myemail;
        $mail->Password = $mypassword;
        $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
        $mail->Port = 587;

        // Recipients & sender
        $mail->setFrom($senderEmail, $fullName);
        $mail->addAddress($myemail, 'Website Contact Inbox'); // Your target email

        // Email content
        $mail->isHTML(true);
        $mail->Subject = "New Contact Form Submission: $fullName";
        $mail->Body = "You've received a new message from your website:<br><br>
        <strong>Name:</strong> $fullName<br>
        <strong>Email:</strong> $senderEmail<br>
        <strong>Message:</strong><br>$messageText";
        $mail->AltBody = "You've received a new message from your website:\n\n
        Name: $fullName\n
        Email: $senderEmail\n
        Message:\n$messageText";

        $mail->send();
        echo "Your message has been sent successfully!";
    } catch (Exception $e) {
        echo "Oops, something went wrong. Error: {$mail->ErrorInfo}";
    }
} else {
    echo $errors . (!$senderEmail ? "\n Error: Invalid email address" : '');
}
?>

If you don't have a php.ini file (common in default or shared hosting setups), try these fixes:

• Create a custom php.ini: Upload a php.ini file to your website's root directory with these settings (adjust paths/values for your server):

  ; Enable mail functionality
  sendmail_path = "/usr/sbin/sendmail -t -i" ; Match your server's sendmail path
  smtp_host = "smtp.gmail.com" ; Your email provider's SMTP server
  smtp_port = 587
  

• Set configs directly in your script: If you can't upload a php.ini, add these lines at the top of your contact.php file (before initializing PHPMailer):

  ini_set('smtp_host', 'smtp.gmail.com');
  ini_set('smtp_port', 587);
  

• Check server restrictions: Some hosts block outgoing SMTP traffic on port 587. If that's the case, try port 465 (SSL) or check your host's docs for allowed mail ports.

If you're using Gmail as your email provider:

• If 2FA is enabled on your account, you cannot use your regular password—create an App Password (only available when 2FA is active).
• Gmail may flag first-time sends from a new server as suspicious. Check your Gmail spam folder or account security alerts to approve the connection.

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