PHP邮件扫描：自动识别并修复损坏的邮件。

function parseEmail($filePath) {
    $fileContent = file_get_contents($filePath);
    
    // 解析邮件头部
    $headers = [];
    $headerPart = substr($fileContent, 0, strpos($fileContent, "

"));
    $headerLines = explode("
", $headerPart);
    $headers['subject'] = '';
    $headers['from'] = '';
    foreach ($headerLines as $headerLine) {
        if (strpos($headerLine, 'Subject:') === 0) {
            $headers['subject'] = substr($headerLine, strlen('Subject:'));
        }
        elseif (strpos($headerLine, 'From:') === 0) {
            $headers['from'] = substr($headerLine, strlen('From:'));
        }
    }
    
    // 解析邮件正文和附件
    $bodyPart = substr($fileContent, strpos($fileContent, "

") + 4);
    $mimeParts = explode("

--", $bodyPart);
    $body = $mimeParts[0];
    $attachments = array_slice($mimeParts, 1);
    
    return [
        'headers' => $headers,
        'body' => $this->cleanupText($body), // 清理邮件正文中的错误字符
        'attachments' => $this->cleanupAttachments($attachments) // 修复损坏的附件
    ];
}

function cleanupText($text) {
    // 移除非法字符
    $text = preg_replace('/[^PCs]/u', '', $text);
    
    // 移除无效编码
    $text = mb_convert_encoding($text, 'UTF-8', 'UTF-8');
    
    return $text;
}

function cleanupAttachments($attachments) {
    $cleanedAttachments = [];
    
    foreach ($attachments as $attachment) {
        // 判断附件类型
        if (strpos($attachment, 'Content-Type: image/') !== false) {
            $cleanedAttachments[] = $attachment;
        }
    }
    
    return $cleanedAttachments;
}