How can PHP developers troubleshoot and resolve issues with "corrupted" downloads when using the readfile function?

When using the readfile function in PHP to download files, sometimes the downloaded files may appear corrupted due to issues with the server configuration or the file itself. To troubleshoot and resolve this issue, PHP developers can try setting appropriate headers, such as Content-Type and Content-Disposition, before calling the readfile function to ensure proper file handling during download. 

$file = 'path/to/file.ext';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . basename($file) . '"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    
    readfile($file);
    exit;
} else {
    echo 'File not found.';
}

Keywords

readfile PHP troubleshooting corrupted downloads resolve

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